1. (Comprehensive questions of Chinese studies and natural sciences) Song Shen Kuo's "Talk about Meng Xi" once recorded: "The Fang family can be cited by a magnet, but it is often slightly east, not completely south." Excuse me, what description is this? A. compass B. earth's magnetic field C. magnetic reaction D. magnetic declination 2. In physics, the definition formula of conductance is G= 1/R(R is resistance). Can we get G'= 1/R'+ 1/R "? A. there is B. there is no C. random decision D. it is impossible to judge. 3. The English name of Laozi, the founder of Taoism, is A. Lao-Zib. Laozi. The changes of solid, liquid and gas in physics are manifested in chemistry because: moreover, they can be enlarged and reduced within a certain range. C due to environmental reasons, the nucleus and electrons of molecules undergo fission reaction, resulting in different states. There is a chemical reaction between substances. 5. (Natural Science Comprehensive Question) Different environments have organisms that adapt to this environment. So, which place in China can adapt to a variety of creatures in different environments? A. northeast B. north China C. southwest D. southeast 6 Recently, a new term-"CPI" appeared around us. What is the official Chinese name of "CPI"? A. Consumer price index B. Consumer consumption level index C. Consumer consumption rising index D. Consumer consumption living standard index 7. And it's a: A. Writer B. Musician C. Thinker D. Philosopher 8. (Comprehensive topic of humanities) Nanjing City in Northern Song Dynasty, now: A. Shandong B. Henan C. Jiangsu D. Beijing 9. The value represented by money is gold. If the country's gold reserves are too small, it will lead to-,which will lead to-. A. The inflation people's living standard drops B. The inflation people's living standard rises C. The deflation people's living standard drops D. The deflation people's living standard rises 10. (Information technology, comprehensive questions of Chinese studies) The binary system in the computer originated from the ancient classics of China: A. Mo Jing B. The Book of Songs C. Zhou Shu D. Zhouyi Answer:1-5: DDBBC 6-10: AC bad1,3, 5, 6,/kloc-. The change of molecular spacing ... few people know this, but Leonardo da Vinci is indeed an encyclopedic figure. This Nanjing refers to Shangqiu, Henan. 9 is an economic topic. Have you talked about high school politics? But this is a good question, and it is more difficult than Samsung Smart Express 1 or so. What is the longest part of the twenty-four histories? (a) A. History of Song Dynasty B. History of Ming Dynasty C. Tang Shi D. History a) A Mirror II. Who adapted the opera of the same name of La Traviata by Dumas? (b) A. Austin B. Verdi C. Flaubert 3. "To be or not to be, that is a question. "Which work is Shakespeare? A. Hamlet B. King Lear C. Macbeth 4. Sherlock Holmes first appeared in which of the following works: (a) A) A Study of Blood Characters B, Murder on the Orient Express C, The Tragedy on the Nile D, Life's Escape 5. Famous sentences in Li Qingzhao's ci. The inscription of "Sad and Sad" is: (d) A. Drunk flowers, B. Cut plum, C. Dreamy, D. Speak slowly, 6. Tagore obtained Nobel Prize in Literature's works as follows: (a) A. Birds B. Chittaglia C. Leaves of Grass D. Don Juan 7. " Cross the rubicon tells the story of a famous figure in history (b) A. Li Yu B. Xiang Yu C. Jia Dao D. Li Shimin 8. How many days does the flowering period of cherry blossoms generally last (c) A. Red C, green D, yellow 10. Qipao originated from the clothing of which ethnic group in China (D) A, Dai B, Han C, Uygur D, Manchu 1 1. Which of the following teams won the most European Champions Cup? (d) A. Manchester United B. Bayern Munich C. AC Milan D. Real Madrid 12. How many gold medals did the China sports delegation win in Busan Asian Games? a . 145 b . 150 C . 155d . 160 13。 Table tennis is the national sport of China. Do you know the names of only three grand slam athletes in the world? (d) A. Waldner, Liu, Wang B. Kong, Wang C. Waldner, Kong, Liu D. Waldner, Kong Huiling, Liu Guoliang 14. Which of the following athletes won the title of CBA Most Valuable Player? (b) A. Yao Ming B. Wang C. Liu Yudong D. Hu Weidong 15. How many NBA championships has "Air Jordan" won? (C) A. 4 times B. 5 times C. 6 times D. 7 times 16. Which province (region) can develop border trade in China? A. Inner Mongolia B. Xinjiang C. Yunnan D. Tibet? 17. The following plains are formed by erosion: (a) Eastern Europe Plain B. Amazon Plain C. Mississippi Plain D. Indus-Ganges Plain 18. The largest regional trade group in the world is (a) European Union (UN) B. World Trade Organization (WTO) C. Organization of Petroleum Exporting Countries (OPEC) D. Association of Southeast Asian Nations (ASEAN). 19. Shwedagon Pagoda, Eiffel Tower, Leaning Tower of Pisa and Angkor Wat are (c) A. France, Myanmar, Italy, Cambodia B. Cambodia, France, Italy, Myanmar C. Myanmar, France, Italy, Cambodia D. Myanmar, Italy, France, Cambodia 20. The big coal mines near Yungang Grottoes are A. Pingdingshan B. Yanzhou C. Huaibei D. Datong 2 1. Frankfurt, where the European Central Bank is located, is Germany (D) A. The most populous city B. The largest port city C. The largest aviation hub city D. The largest high-tech industrial center 22. The classical gardens in China, known as the "Garden of Ten Thousand Gardens", are (a) A. Yuanmingyuan B. Summer Palace C. Humble Administrator's Garden 23. During the Warring States period, the thinkers who advocated equality, mutual love and mutual benefit among the people and opposed unjust wars were (D) A. Confucius B. Mencius C. Laozi D. Mozi 24. During the Warring States period, who was the famous doctor who summarized the previous medical experience and diagnosed four times? (d) A. Li Shizhen B. Hua Tuo C. Li Bing D. Bian Que 25 The largest and richest grottoes in China are: (a) A. Dunhuang Mogao Grottoes B. Longmen Grottoes C. Yungang Grottoes 1. The first poetess was Cai Yan (Wen Xi) 2. The first poetess was Li Qingzhao 3. The first dictionary is: Erya 4. The first encyclopedia is: Yongle Dadian 5. The first book of poetry is: Book of Songs 6. The first anthology. 9. The first collection of classical Chinese novels: Shi Shuo Xin Yu 10. The first collection of classical Chinese novels: Search Ji Shen 1 1. The first recorded work: The Analects of Confucius The first biographical history: Historical Records 12. The first chronicle book is: Chunqiu 65438+. 5438+05. Part II Sima Qian, Sima of the Western Han Dynasty. Sima Xiangru 16. Two Beauties of Yuefu: Mulan word Peacock flies southeast, and "Fu Qin Yin" is the three unique poems of Yuefu 17. The Double Treasure of History: Historical Records as a Mirror 18. Two beats: the first moment of surprise, the second moment of surprise (Ling Mengchu) 19. Da Du Li: Li Bai Du Fu Xiao Du Li: Li Shangyin Du Mu 20. The Gemini of China's Modern Literature: Lu Xun and Guo Moruo. Three generations: week 23. Three biographies of Spring and Autumn Annals: Zuo Zhuan Zhuan Zhuan 24. Three Kings: Yu Xia, Shang Tang and Duke Zhou. Sanshan: Penglai abbot Yingzhou 26. Three religions: Confucianism, Buddhism and Taoism 27. Sangong: Zhou Dynasty, Sima Situ Sikong//Western Han Dynasty, Prime Minister Tai Wei, Imperial censor Qingming, Taishi Taifu Taibao 28. Three Cao Cao: the twenty-ninth Cao Cao and Cao Pi. Third Hospital of Public Security: Yuan Zhongdao, Yuan Hongdao and Yuan Zongdao 30. Jiangnan Sangu Building: Yueyang Tower, Wuchang Yellow Crane Tower, Hunan 3 1. Three friends in cold years: Song 32. Sanfu: Zuo Fengyi, You Fufeng, Jing 33. Three elements in scientific research: after having obtained the township entrance examination, taking the senior high school entrance examination, palace examination and Zi. Top scholar) 34. The court exam is three ding Jia: the top 35. Three quintessences of China: Peking Opera, Traditional Chinese Medicine and Traditional Chinese Painting. Three words: Yu Shiming's words of warning and awakening (Feng Menglong) 37. Three Confucian Classics: Zhou's Book of Rites 38. Sanzang: Xin 'an official, Shi Haoguan, Tongguan official 39. Three Farewells: Newly married, don't be old, don't be homeless. Flower Regeneration of Guo Xiang Tang Di 4 1. Mao Dun's trilogy "Erosion": Disillusionment and wavering pursuit of the countryside trilogy: Spring silkworm harvest disappears in autumn and winter 42. Ba Jin's Trilogy of Love: Thunderstorm and Torrent Trilogy: Home, Spring and Autumn 43. First national history: Mandarin 44. The first album recording the words and deeds of counselors and guests:. Text: Yan Zi Chunqiu 46. The first great patriotic poet: Qu Yuan. The first narrative poem: Peacock Flying Southeast (357 sentences, 1785 words) 48. The first monograph on literary criticism: On Classics. Paper > > (Cao Pi) 49. The first pastoral poet: Eastern Jin Dynasty, Tao Yuanming 50. The first monograph on literary theory and criticism: Liu Xie's Wen Xin Diao Long 5 1. The first monograph on poetry theory and criticism: Zhong Rong's Poems, 52 pages. A comprehensive academic work written in the form of notes —— On Meng Xi by Shen Kuo in the Northern Song Dynasty. 53. The first diary travel notes: Xu Hongzu's travel notes in the Ming Dynasty. 54. The first poetess, also known as "a pronoun". Li Qingzhao's Common Sense of Chinese (2) 1. China's first satirical novel: The Scholars II. 3. China's first collection of short stories in classical Chinese created by individuals: Strange Tales from a Lonely Studio. 4. The first short story in the history of China's new literature is Diary of a Madman. The first writer who opened up the "Fairy Tale Garden" was Ye Shengtao. 6. China's first romantic fairy tale: Journey to the West. 7. The first reportage work is: (Xia Yan) Bonded Labor. 8. The first person in New China won the title of "People's Artist". His works are: Longxugou 9. The two outstanding schools in the pre-Qin period were Confucianism and Mohism 10. The two representatives of Confucianism are: Kong Qiu and Mencius, who are regarded as the most holy and the less holy respectively. 1 1. During the Kaiyuan and Tianbao years of the Tang Dynasty, there appeared two schools of frontier fortress ci, represented by Gao Shi and Cen Can, and frontier fortress ci represented by Wang Wei and Meng Zi. The former is bold and bold, while the latter is simple and simple. Song ci is usually divided into two schools: bold and graceful. The former is represented by Su Shi and Xin Qiji, while the latter is represented by Liu Yong, Zhou Bangyan and Li Qingzhao. 13. Two banners held high by the May 4th New Culture Movement: opposing old ethics, advocating new morality, opposing old literature and advocating new literature 14. Diaries of Two Madmen >> The authors are: Russian Nikolai Gogol and China Lu Xun 15. There are two great epics in world literature: Iliad Odyssey 16. The three treasures of Buddhism are: Buddhism (I know a lot), Buddhism (the teachings of the Buddha) and monks (the people who inherit or preach the teachings) 17. Three from four virtues, three from the father: marry from the husband. The third Geng day in summer is the first day of the first stay, the fourth Geng day is the first day of the intermediate stay, and the first Geng day after the autumn festival is the first day of the last stay. The first stay is ten days, the last stay is ten days, and the middle stay is ten days and twenty days. 19. Three cardinal guides and five permanent members: Three cardinal guides: the father is the son, the group is the minister and the husband is the wife. The five permanent members: benevolence, righteousness, courtesy and wisdom. 20. Three aunts and six grandmothers: nuns, goddesses and six grandmothers: matchmakers, grandmothers, goddesses and midwives, 2 1. Three Emperors and Five Emperors: Huang San and Fuxi. 96: the name of Confucianism, Taoism, Yin and Yang, Mohism and miscellaneous farmers. 23. Three Mountains and Five Mountains: Sanxian Mountain in the East China Sea: Yingzhou, Penglai and Abbot; Wuyue: Dongyue Taishan Nanyue Hengshan Xiyue Huashan Beiyue Hengshan Zhongyue Songshan 24. Three natures: cattle, sheep and pigs are sacrificed (too prison) (less prison without cattle) 25. Three unification: the principle of drama creation formulated by European classical generalized drama theorists is the consistency of place, time and plot. 26. Samoan Buddhism: Stop worrying and focus on one situation. (One of the methods of practice) 27. Buddhist Sanzang: It is always said that the fundamental doctrine is scripture and the precepts are dharma. Interpret the doctrine as a theory (Sanzang Master is famous for Sanzang's knowledge) 28. Three provinces and six departments: three provinces: Zhongshu Province (decision-making), Xiamen Province (deliberation), Shangshu Province (execution), and six departments: Li Hu Li Gongzheng 29. Su San: Su Su Xun Su Shizhe's three armies: upper, middle and lower//left, middle and right//land, sea and air 30. March 35: Wu Xinghui, Wu Jun. Qu Wang (northern Shaanxi) 32. Three Chu: Ling Gang-Wu Chu-Dongchu Pengcheng-Xichu 33. Three primary colors: red, green and blue. Three Graves: Fuxi Shennong Huangdi Fifth Hall: Shao Hao Zhuan Xu Gaoxin Tang Yao Yu Shun 35. Three-body Stone Classics: Zuo Zhuan of Chunqiu Shangshu//A Biography of Ancient Chinese Writing Han Li wrote China's Common Sense in three fonts (3) Four books: Yuan Gui Wen Yuan Hua Ying Quan Yu 3. Four Kings of Warring States: Qi, Zhao and Wei Guoxin of Chu. Four masters in the early Tang Dynasty: Yang Jiong, Lu, Luo. Four Great Masters in Northern Song Dynasty: Wang Anshi, Ouyang Xiu, Su Shi and Huang Tingjian. Four Great Masters in Yuan Dynasty: Guan Hanqing, Ma Zhiyuan, Bai Pu and Zheng Guangzu. The four great talents of Nanming:,, and Wen. Zhou wenbin 8. Four Great Calligraphers in Northern Song Dynasty: Su Shi, Huang Tingjian, Mi Fei and Cai Xiang. Four great calligraphers: Tang Yan Zhenqing, Liu Gongquan, Ouyang Yu Yuan and Zhao Meng? \ \ \10. Four calligraphy styles: true (open) seal 1 1. Four Treasures of the Study: Hu Biwei, Xuan Mo Paper Duan Yan 12. Four major libraries in China: Beijing Wen Yuan Pavilion, Shenyang Wen Yuan Pavilion, Chengde Jinwen Pavilion and Hangzhou Wen Lan Pavilion 13. Four Arts of Ancient Literati (Wenrenju 15. Quetiapine fumarate Ku: Shi Jingji 16. Four brothers ranking: Bo (Meng) Ji 17. Wuhu: Xiongnu Xianbei Jieqiang 18. Wuhua: Jin Juhua-the flower girl Kapok-the daffodil that treats people on the street. Life occupies the level of divination-selling the color of herbs-hanging tricks-juggling-storytelling and pingtan group-singing holes in the street-setting up tents and chatting with paper-singing 20 on the high platform. Seven Sages of Bamboo Forest: Ji Kang, Ruan Ji, Dan Tao, Xiang Xiu, Ruan Xian, Wang Rong and Liu Ling, 6438+0. Seven sons of Jian 'an: Kong Rong, Chen Lin, RoyceWong, Xu Qian, Ruan Yu, Ying Yi and Liu Zhen. Guo Qixiong: Zhao Chuyan 24. Seven emotions: joy, anger, sorrow, fear, love, evil desire 25. Seven ancient capitals: Beijing, Xi, Luoyang, Kaifeng, Nanjing, Hangzhou and Anyang. The Eight Immortals of Myth: Tie Guai Li, Han Zhong, Zuo Zhang, He Xiangu, Lan Cai He, Han Xiangzi, Cao Guojiu, 27. Eight Great Masters in Tang and Song Dynasties: Han Yu, Liu Zongyuan, Ouyang Xiu, Su Xun, Su Shi, Su Zhe, Wang Anshi, Ceng Gong, 28 Dynasties: Eastern Han Wei, Song, Jin, Qi, Liang and Sui Chen 29. The eight solar terms in the four seasons refer to: beginning of spring vernal equinox, long summer solstice, beginning of autumn autumnal equinox, and the beginning of winter solstice at 30. Bagua: Gan Kun, Zhen, Kan, Li and Geng pairs symbolize thunder, wind, water, fire, mountain and mountain respectively, 365,438+0. Eight-part essay: Eight-part essay: Starting from the topic, 32. Wang Liyi Jin Nong Huang Shen Gao Xie 33. Kyushu refers to: Ji Yan Jing Qing Yang Liang Yong Yu Xu 34. Nine clans refer to: great-great-grandfather's own son, great-great-grandson, great-grandson, great-grandson, great-grandson and great-grandson 35. The nine chapters refer to: the mourning of Huai River, thinking about the beauty of Huai Sha, and the past of Huai Orange. Nine songs mean: Mrs. Dong Huang Taiyun Xiang thinks less about the spirit of Hebo's national mourning, 37, and 38, a nine-Canadian novelist. The ten female poets in the history of China are: Ban Jieyu (the ancestor aunt of Ban Gu), Cai Yan, Zuo Fen (the younger sister of Zuo Si),,, Bao (the younger sister of Bao Zhao), Xue Tao, Li Qingzhao, Zhu and Qiu Jin. Ten classic tragedies in China: Yuan, orphan of Zhao, big flag, green bell spectrum, peach blossom fan, Han Dynasty. Classic Xi drama: saving the wind and dust, Hosta, The West Chamber, Kanqian slave, the wall, the negative scenery of Li Kui jy, You Geji, Zhongshan Wolf, Kite Wrong 4 1. Ten-day cadres: A, B, C, D, E, G, Xin 42. China's Top Ten Dramas:. "Sister 43. Twelve earthly branches: ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son, ugly son Ying Zhong 47 Thirteen Classics: The Book of Changes, Shangshu, The Book of Songs, Zhou Li, Yi Li, Zuo Zhuan, Li Ji, Gongyang Zhuan, Gu Liangzhuan, The Analects of Confucius, Mencius, Xiao Jing and Er Ya 48. Qixi refers to July 7, 49. Ten most heinous crimes. Mount Putuo, Meishan, Jiuhuashan, 2. China's four great inventions: compass, papermaking, printing, gunpowder, 3. Four diagnostic methods of traditional Chinese medicine: seeing, listening, asking and feeling, 4. Opera, 4. Famous Taoist Mountains: Wudang Mountain in Hubei, Longhu Mountain in Jiangxi, Qingcheng Mountain in Sichuan and Yun Qi in Anhui. Four Grottoes: Yungang Grottoes, Longmen Grottoes, Maijishan Grottoes, Dunhuang Mogao Grottoes, 7. Yueyang Tower, Yellow Crane Tower, Tengwangge Taibai Building 10. Four classic novels: Romance of the Three Kingdoms, Water Margin and The Journey to the West's Dream of Red Mansions 1 1. Four novels of condemnation: the appearance of officialdom (Li) the strange situation witnessed in the past two years (Wu) Lao Can's Travel Notes (Liu E) Nie Haihua () 65438+. Yingtai White Snake and Xu Xian 13. Four ancient beauties: Shi (sinking fish), Wang Zhaojun (falling geese), The Story Of Diu Sim (closing the moon) and (feeling ashamed of flowers) 14. Four ancient beauties: talking about music//The beautiful scenery in the bright morning is enjoyment 15. Four Bachelor's degree of Su Men: Huang Tingjian, Qin Guan Zhang Bu, 16. Four histories: Historical Records, Han Shujun, Han Shu, Three Kingdoms, 17. Four historical academies: Bailu Cave in Lushan Mountain, Hengyang Stone Drum in Yuelu Mountain in Changsha, 19. Ancient auspicious four spirits: dragon and phoenix, unicorn and tortoise. Cheng Youmao 2 1. Four-level professional titles and enrollment personnel: Academy Examination-Provincial Examination-Juren Examination-Gong Sheng palace examination-Jinshi 22. Four great writers of past dynasties: Han Zongyuan and Ouyang Xiu Shi. Three histories with high historical and literary value: Hou 24 Historical Records. Father and son in Class Three: Class Zhao 25. Shu Wei is mentioned in three books. 26. Zuo Si's Sandu Fu refers to: Shu Du Fu (Chengdu) Wu Du Fu (Nanjing) Fu (Ye) 27. Three thanks in Southern Dynasties: Xie Lingyun, Xie Huilian and Xie Tiao. Three thin poets mean: Li Qingzhao's three famous sentences are: 29. Don't forget me, the curtain rolls west wind, and people are thinner than yellow flowers. 30. Do you know? It should be fat red and thin 3 1. The newcomers have lost weight, not a thousand diseases, not a sad autumn. 32. Three kinds of textbooks used in old bookstores are referred to as "Three Thousand Fingers" for short: Three-character Classics of Hundred Family Names. 33. Zheng Banqiao has three unique fingers: painting, poetry and calligraphy. 34. Lu Xun's three collections of short stories: Scream, Hesitation and New Stories. 35. The three major prose writers in the history of modern literature in China are Liu, Yang Shuo and Qin Mu. 36. Goch's autobiography trilogy is My University 37. The works of three misers in the world are: Old Grande Shylock pours out Higgins 38. Lao She's novel "Four Generations under One Family" is also a trilogy: Doubt, Gouge and Famine. In ancient China, there were four big cities called Sijing: Tokyo-Xijing in the capital of song dynasty-Chang 'an Nanjing-Jinling Beijing-Shuntian 49. 465,438+0. Four outstanding people in Wuzhong at the end of Yuan Dynasty and the beginning of Ming Dynasty: Gao Qi Yangji, Zhang Yu and Xu Ben 42. The four major love dramas of Yuan Zaju are: The Story of the White Rabbit, The Moon Pavilion and Killing Dogs (5) 65,438+0. Four Great Tragedies of English Shakespeare: Hamlet and King Lear. 3. Four-body refers to four-body laziness: human limbs. 4. Four-body empty refers to the four elements of the universe composed of earth, fire, water and wind. 5. Guan Zhong regards the four virtues of courtesy, righteousness, honesty and shame as the four basic principles of governing the country.
In the north of China, for indoor heating, hot water is transported from the boiler to the room through pipes, and traces of being smoked can often be seen on the ceiling above the pipes. (1) Please explain the reason for this black mark; (2) Propose an observation or experiment method to judge the correctness of the above explanation.
1.
This black mark should be due to the high water temperature in the pipeline and long-term "baking", resulting in the ceiling being baked black.
2.
First, you can compare the place above the pipeline with the place without the pipeline-the top of the pipeline is baked black, but there is no such trace on the ceiling above the place without the pipeline passing through;
Second, compare winter and summer-this kind of trace will appear when there is heating in winter, and it will not appear when there is no heating in summer (instead of blackened ceiling).
2. As shown in Figure 6, it is the circuit diagram of the incubator made by the science and technology activity group of a school, and the heating wire is the heating element of the incubator. The mercury thermometer in the figure is a conductive thermometer, the height of the upper lead A can be adjusted, the lower lead B is in contact with the mercury of the thermometer, and the mercury bubble of the thermometer is placed in the thermostat. Please explain the working principle of thermostat according to this circuit diagram.
Answer: When the temperature of the thermostat does not reach the temperature indicated by the conductive thermometer wire after being electrified, the electric heating wire is connected in the circuit to raise the temperature of the thermostat. When the mercury column in the conductive thermometer rises to the temperature indicated by the gold wire, the relay coil is turned on, the armature is sucked down, and the heating wire is turned off to stop heating. After the temperature drops, the coil circuit is disconnected, the armature is released, and the heating wire is reconnected to keep the temperature in the thermostat constant.
3. As shown in figure 14, the skier slides down the slope while keeping his body posture unchanged. According to this situation, please ask two questions related to physical knowledge and explain them.
Question 1: Why is the area of snowboarding larger?
Note: If the pressure is constant, increasing the contact area can reduce the pressure.
Question 2: Why is the lower surface of the snowboard so smooth?
Explanation: reduce the roughness of contact surface, thus reducing friction.
Question 3: Who are the athletes relative to? Who is stationary relative to?
Explanation: The ground is moving and the skis are stationary.
Question 4: Why do athletes squat? It shows that this can reduce the center of gravity and increase the stability.
Question 5: Why can athletes make rapid progress?
Description: when sliding down the slope, the potential energy of gravity is converted into kinetic energy; Pull the brace hard, and the force changes the motion state of the object, so that the athletes can move forward quickly.
4. Blow on the back of your hand, exhale, tell your feelings and explain the reasons.
A: It feels great when you blow it. Because blowing accelerates the air flow on the surface of the back of the hand and accelerates the evaporation and heat absorption of water on the back of the hand, it feels very cold. I feel hot and humid when I breathe, because the temperature of hot air is higher than that of the back of my hand. When it is cold, water vapor liquefies into small water droplets, which gives off heat, so I feel hot and humid.
5. In the arid area of western China, the annual evaporation of water is much greater than the annual precipitation, and some lakes are drying up and shrinking rapidly. Considering the factors affecting evaporation rate, the reasons for the large annual evaporation of local water are explained.
Answer: (on the water) the airflow is fast or the wind is strong in the west, which accelerates evaporation; High temperature (hot weather) accelerates evaporation; Large water area accelerates evaporation.
6. When there is an electrical fire, what measures should people at the scene of the fire take and what problems should they pay attention to? Put forward your own suggestions according to your own physical knowledge.
A: First cut off the power supply. Don't put out the fire with water (before cutting off the power supply). In addition, it is recommended to call the fire alarm for help. Self-help measures such as escape can also be given 1 point. If the power supply is not cut off in the proposal, the whole problem will only get 1 point.
7. Due to vehicle overload, the annual loss of expressways in China is as high as 30 billion yuan. When the vehicle load is more than twice the standard load, if it is driven on the asphalt pavement once, the damage to the pavement is equivalent to 256 times when it is driven under the standard load. If you drive on the cement pavement once, it is equivalent to 65536 times of standard load driving. It can be seen that it is urgent to control overload operation. The State Council promulgated the "Regulations on the Implementation of the Road Traffic Safety Law of the People's Republic of China", which came into effect on May 1 2004, providing a legal basis for controlling overload operation. Please explain from two aspects: why does overloading of vehicles accelerate road damage?
Answer: (1) If the vehicle load exceeds the standard, the pavement pressure will increase, which will accelerate the pavement damage;
⑵ If the vehicle load exceeds the standard, the road surface pressure will increase, and the road surface friction will increase, which will accelerate the road surface damage.
8. Fill the electric kettle with water and connect it to the power supply. After a while, the water boiled and the lid of the pot was observed to be jacked up. Please tell me about the energy conversion involved in this process.
Answer: (1) In the process of water heating, electric energy is converted into internal energy.
⑵ When the lid is jacked up, the internal energy is converted into mechanical energy.
9. In order to study the factors related to the evaporation rate of liquid, Xiao Ming put the same volume of water and alcohol into two identical beakers, and then put them in the same room (same environment). After a while, he observed that the level of alcohol was significantly lower than that of water. Try to put forward a related problem according to the phenomenon of evaporation speed.
A: Is the evaporation rate of liquid related to the type of liquid?
10, in the cold winter, flowers bloom in the greenhouse. This is because the glass in the greenhouse allows the heat radiation of the sun to pass through, but prevents the heat and moisture in the room from escaping. In a sense, the earth is also a big greenhouse. Gases such as water vapor and CO2 in the troposphere let the heat radiation of the sun pass through, which prevents the surface heat from emitting, thus making the surface warm and humid. However, the content of CO2 in the troposphere increases obviously, which leads to the increase of the global average temperature, that is, the "greenhouse effect".
Please give an example to talk about the possible changes caused by the greenhouse effect. Talking about how to control the greenhouse effect in combination with reality.
A: The "greenhouse effect" makes the original balance out of balance, which will lead to melting glaciers and rising sea levels; The evaporation of surface water is accelerated; Intensifying land desertification; Cause climate change; Affect crop harvest, etc.
Afforestation can be used; Developing and utilizing new energy sources; Measures to reduce the use of fuels such as coal.