Chemistry examination paper 20 1 1.5
Instructions for candidates 1. This test paper is ***8 pages, * * * 4 big questions and 35 small questions, with a full score of 80. Examination time 100 minutes.
2. Fill in the school name, name and admission ticket number accurately on the test paper and answer sheet.
All the answers are filled in the answer sheet, and the answers on the test paper are invalid.
4. After the exam, return the test paper and the answer sheet together.
Possible relative atomic masses: H- 1, C- 12, O- 16, Mg-24, Si-28, S-32, Cl-35.5 and Ca-40.
1. multiple-choice questions (only one option in each question meets the meaning of the question. ***25 small questions, 65438+ 0 points for each small question, ***25 points)
1. No new substances are produced in the following changes.
A. litmus turns blue when it meets alkali. Grapes turned into red wine.
C. Snow melts slowly. D. Food is digested in human body.
2, the composition of the air, the volume fraction of about 265438 0% is
A. Oxygen B. Nitrogen C. Carbon dioxide D. Rare gas
3, the following common substances, belong to the pure substance is
A. vinegar B. distilled water C. soy sauce D. soybean milk
4, the following common medical solutions, the solvent is not water.
A. Glucose injection B. Disinfecting alcohol C. Normal saline D. Iodine
5, oxygen molecules in the following substances are
A. carbon dioxide B. potassium permanganate C. liquid oxygen D. water
6, the closest relationship with the chemical properties of elements is
A. number of protons B. number of neutrons C. number of outermost electrons D. number of electron layers
7. Chenzhou City, Hunan Province, China is rich in scheelite, which is not only a scarce strategic material in China, but also contains many precious metals such as lead, zinc, molybdenum and copper. Where lead, zinc, molybdenum and copper refer to
A. simple materials? B. element C. atom? D. molecules
Gas stations, flour mills, textile mills and coal mines are all shown in the following figure.
A B C D
9, in the following statement, the wrong is
A. soda ash is not alkali B. salt is not salt C. mercury is not silver D. dry ice is not ice.
10, the following belong to phosphate fertilizer is
A.NH4NO3 B.K2CO3 C.Ca3(PO4)2 D.KNO3
1 1, the use of the following substances has nothing to do with the chemical properties of the substances.
A.CO as fuel B. CO2 as fire extinguishing agent.
C. calcium carbonate fine powder is used as white paint and alcohol is used as fuel.
12. Under pressure, 0.024m3 steel cylinder can be filled with 25m3 liquefied petroleum gas (including propane, butane and other gases), which can be explained as follows.
A. the molecular mass is very small. Molecules are made of atoms.
C. there are gaps between molecules. D. molecules are constantly moving.
13, the following experimental operations are wrong
14, the chemical formula of the following substances, the wrong writing is
A. Calcium carbonate B. Sodium carbonate (NaCO3)
C. calcium oxide and zinc chloride
15, the normal pH range of some liquids in human body is as follows. Under normal circumstances, those liquids that must be acidic are
Plasma, milk, saliva, bile, pancreatic juice and gastric juice.
The pH range is 7.35 ~ 7.45 6.6 ~ 7.66 ~ 7.17.1~ 7.37.5 ~ 8.00.9 ~1.5.
A. gastric juice, blood, milk and saliva
16, the periodic table of elements is an important tool for learning chemistry. The figure below shows a grid in the periodic table of elements. From the information obtained from this diagram, it is correct that
A. the atomic number of this element is 52 B, and this element belongs to non-metallic elements.
C the content of this element in the earth's crust is 52.00%. The atom of this element has 24 electrons.
17. A lot of rubbish we throw away every day is valuable renewable resources. So the garbage in our life should be recycled separately. Among the following substances, which belongs to recyclables is ① paper? 2 plastic? 3 glass? ④ metal
A.①②③? B. ①③④？ c？ ②③④? D.①②③④
18, using sodium chloride solid to prepare a certain mass fraction of sodium chloride solution, unnecessary instruments are
A.B. C. D。
19 the fuel used in the "Xiangyun" torch of the 29th Olympic Games is propane (C3H8), and its combustion chemical equation is:
C3H8+5O2 x CO2+ y H2O, where x and y are respectively
A.3 4 B.3 8 C. 1 3 D. 1 5
20. The picture on the right is a widely used experimental device that we are familiar with, but it is not applicable.
A. collecting gas through exhaust; B. collect gas by discharging gas.
C, using it as a reaction container for gas explosion experiment.
2 1, neutralization reaction is widely used in industrial and agricultural production and daily life. The following applications have nothing to do with the neutralization reaction principle.
A. applying hydrated lime to improve acidic soil B. taking drugs containing Al(OH)3 to treat hyperacidity.
C. making caustic soda by the action of hydrated lime and soda ash D. washing the residual sulfuric acid in petroleum products with NaOH solution.
22, put the following groups of substances in water, after stirring can get colorless and clear solution is
A. Potassium nitrate, hydrochloric acid, copper chloride, hydrochloric acid, iron and iron oxide
C. sodium carbonate, sodium chloride, calcium hydroxide, sodium hydroxide, KCl and sulfuric acid.
23. After adding a certain amount of zinc powder and iron powder into copper sulfate solution to react fully, some solids can be obtained by filtration. When a small amount of dilute sulfuric acid is added to the solid, gas generation can be observed. The following description of the solid is correct.
① There must be zinc, ② there must be iron, ③ there must be copper, ④ there may be zinc, ⑤ there may be iron and ⑤ there may be copper.
A.①、②、③ B.②、③、④
C.③、④、⑤ D.①、②、⑥
24, the following images can't correctly reflect the corresponding operation is
A B C D
In a certain amount of CaCl2 _ 2 solution, CO2 gas, Zn and Mg with the same mass react with dilute sulfuric acid with the same volume and mass fraction respectively. In NaOH solution, CaCO3 and dilute hydrochloric acid with the same mass are added dropwise to react with dilute hydrochloric acid with the same volume and mass fraction respectively.
25. A mixture of Mg(OH)2 and MgO contains 48% magnesium. Take 10g of this mixture and put it into a proper amount of dilute sulfuric acid for complete reaction. The mass of solute in the obtained solution is a.12gb.24gc.36g d.48g.
Two. Fill in the blanks (***30 points)
26.(6 points) Chemistry is closely related to life.
(1) Figure 1 is a table of nutritional components of a biscuit. Known six nutrients needed by the human body, not listed in this table is _ _ _ _ _ _ _ _ _; Vitamin D contributes to the absorption of "calcium", where calcium refers to _ _ _ _ _ _ (filling molecules or elements).
(2) Calcium deficiency in human body may cause _ _ _ _ (filled in letters).
A. anemia B. rickets C. scurvy D. osteoporosis E. rickets
(3) Fig. 2 is a device diagram of water electrolysis. The test tube ① is connected to the _ _ _ _ _ pole of the power supply; Write the chemical equation of this reaction _ _ ▲ _.
(4) Magnesium hydride (chemical formula: MgH2) is a hydrogen storage alloy, which is widely used in hydrogen energy vehicles. Its solid can react with water to form alkali and release hydrogen at the same time. The chemical equation of this reaction is _ _ _ _ _.
27.(6 points) According to the solubility table and solubility curve of sodium chloride and potassium nitrate, answer the following questions:
(1)B is the solubility curve of _ ▲ _ _.
(2) At 30℃, the solubility of sodium chloride _ ▲ _ (greater than, less than or equal to) the solubility of potassium nitrate.
(3) In order to convert the unsaturated solution of potassium nitrate into a saturated solution, one of the methods that can be adopted is _ _ _ _ _.
(4) potassium nitrate mixed with a small amount of sodium chloride, the way to get pure potassium nitrate is _ _ _ _.
(5) As shown on the right, beaker A is saturated with calcium hydroxide solution. After adding quicklime to beaker B, beaker A became turbid. The possible reason is _ _ _ _ _ (fill in the serial number).
A. the reaction consumes water and calcium hydroxide precipitation.
B. The reaction is exothermic and the solubility of calcium hydroxide decreases.
C, calcium hydroxide generated by the reaction between quicklime and water is no longer dissolved.
28.(6 points) It is the characteristic of chemistry to establish the relationship between macro, micro and symbols.
There are four substances, A, B, C and D, and their microscopic schematic diagrams are shown in the following table.
Material ABC D- hydrogen atom
-Carbon atoms
-Oxygen atoms
Microscopic schematic diagram
There are _ _ _ _ _ _ atoms in the molecule of (1)/substance B.
(2) Among the above substances, _ _ _ _ _ belongs to simple substance, and _ _ _ _ _ belongs to organic matter. [Fill in chemical formula]
(3) The mass ratio of the two elements in substance C is _ _ ▲ _.
(4) Put a certain mass of four substances A, B, C and D into a closed container and fully react under the action of electric spark, and measure the mass of each substance before and after the reaction as follows:
A B C D
Mass before reaction /g 25 1 10 74
Mass after reaction /g 9 37 a 10
Where the value of A is _ _ ▲ _, and the stoichiometric ratio of A to D in this reaction chemical equation is _ ▲ _.
29.(6 points) Metals are widely used.
(1) wok is commonly used in our daily life, mainly using the property of iron (fill in the serial number) _ _ ▲ _.
A. Thermal conductivity B. Electrical conductivity C. Ductility D. Metallic luster
(2) Rust spots often appear when the wok is placed after being washed with water. The reason why the iron pan rusts is _ _ ▲ _.
(3) Write the chemical equation _ _ _ _ for the reaction of iron with copper sulfate solution.
(4) In industry, iron is often reduced from iron ore with carbon monoxide at high temperature. If iron is smelted with hematite (mainly composed of iron oxide), write the chemical equation _ _ ▲ _.
(5) Brass is similar to gold, and criminals often use it to cheat. Its main component is copper-zinc alloy. Please distinguish brass from gold by chemical method. The method is _ _ _ _.
30.(6 points) A to G are seven common substances in junior high school chemistry, and their transformation relations under certain conditions are shown in the following figure (some reactants or products are omitted). Please answer the following two questions.
(1) If both C and G can react with the same substance, the generated E is a simple substance, F is a compound, and the chemical formulas of E and F are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(2) If ② ③ is the same reaction, ④ is a combined reaction. A to G are all compounds, and B, C and D are composed of two elements, so the chemical molecular formulas of E and F are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Iii. Experimental questions (* *19)
3 1, (6 points) The following figure shows the equipment used to make and collect gas in the laboratory. Please answer the following questions:
(1) Write the name of the instrument marked ① in the above picture: _ _ _ _ _ _ ▲ _ _.
(2) Using potassium permanganate to generate oxygen, the generator is selected as _ _ _ _ _ (fill in alphanumeric characters, the same below), and the chemical equation of the reaction is _ _ _ _ _ _ _ _.
(3) To prepare carbon dioxide in the laboratory, the solid drug should be _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
(4) The picture on the right shows a bottle of colorless and pure gas that a classmate put on the table. It is known that it may be oxygen or carbon dioxide. The chemical method to determine gas is _ _ _ _ (write a method casually).
32.(***5 points) Group A used sodium carbonate and lime milk to prepare caustic soda. After the reaction, the precipitate was filtered out and the filtrate was evaporated to obtain a crude product. Group students analyze the purity of crude products according to the following experimental process.
A. crude product B. saturated sodium bicarbonate solution C. sodium hydroxide
(1) experimental data: carbon dioxide is almost insoluble in saturated sodium bicarbonate solution.
(2) Operating steps:
① The mass of weighing device D is m1g;
(2) wiring device, check the air tightness;
(3) slowly dropping excessive concentrated hydrochloric acid into the conical bottle filled with the crude product until no bubbles appear;
(4) The weight of the re-weighing device D is m2 grams (m1￠ m2; It is assumed that all the generated gas is absorbed by the device d).
(3) According to the above experiment, answer the following questions:
(1) The crude product must contain _ _ _ _ _ _; There cannot be _ _ ▲ _ _.
(2) the reagent in c is _ _ _ _ (fill in the name of the substance).
③ The purity of caustic soda measured in this scheme is less than the theoretical value. Please analyze the reason of "smaller".
33.(8 points) Xiaoli went to grandpa's house and found that grandpa bought an oxygen generator. She carefully read the description of the oxygen generator used and became interested in it.
What is the main component of agent A and what is the function of agent B?
Sodium percarbonate (chemical formula: 2Na2CO3 3H2O2) is commonly known as solid hydrogen peroxide, with white crystalline particles. When sodium percarbonate is dissolved in water or heated, it is decomposed into sodium carbonate and hydrogen peroxide, which is a good solid oxygen releasing agent.
Guess 1: Agent A may be sodium percarbonate.
Conjecture 2: The function of agent B is catalysis.
Please help Xiao Li finish the following experimental report.
Verification conjecture ⅰ
Main operation steps, main experimental phenomena and experimental conclusions
Experiment ①
As shown in the left figure, take a small amount of agent A and put it in a test tube, and add water to dissolve it.
Then _ _ ▲ _. Produce a lot of gas
___▲___。
___▲___。
Experiment 2: Put a small amount of medicine A into a test tube, add water to dissolve it, and then pour the solution into another test tube with a small amount of manganese dioxide.
Later, a piece of wood with Mars was put on the mouth of the test tube, which produced a lot of gas.
This gas rekindled the sticks with Mars.
___▲___。
Through the analysis of the above experimental results, it is preliminarily concluded that the main component of agent A is sodium percarbonate.
Verification conjecture Ⅱ
Experimental steps, explanations or conclusions of experimental phenomena
In experiment 3, a package of medicine A and a package of medicine B were placed in an oxygen-making box filled with water. After oxygen is generated, the residue is taken out, filtered, washed, dried and weighed. The solid mass is called 3g _ _ _.
Experiment ④
___▲___。 A lot of gas is produced, which makes the wooden strips rekindle Mars.
___▲___。
Through the analysis of the above experimental results, it is concluded that the role of agent B is catalysis.
Please put forward reasonable suggestions on the storage of oxygen generator or the treatment of residue after reaction: _ _ _ _ _ _ ▲ _.
Four, the calculation problem (***6 points)
34.(3 points) Silicon (Si) is an indispensable material in solar cells and computer chips. An important chemical reaction in silicon production is SiO2+2C, high temperature Si+2CO↑. How many grams of silicon dioxide (SiO2 _ 2) does it theoretically need to produce 5.6 grams of silicon?
35.(3 points) There is a limestone sample, which is composed of CaCO3 and SiO2. Students in extra-curricular group added 100 g hydrochloric acid into 35 g limestone sample for five times (it is known that SiO2 _ 2 does not react with hydrochloric acid) and got the following information;
Time 1, the second time, the third time, the fourth time and the fifth time.
Quality of hydrochloric acid added/g 20 20 20 20 20 20
Mass of remaining solid /g 30 25 20 15 15
To make the solution after the fifth experiment into 10% CaCl2 solution, you can add enough limestone powder to this solution first, and then filter it after the reaction is complete. Please calculate: how many grams of water do you need to add to the filtrate at this time? (Assuming that the loss of solution is ignored during the experiment)
I would like to invite you to use the 20 1 1 Shunyi mode 2 chemistry test questions and answers. Thank you for reading the vicissitudes of life. The pleasure of reading is fragrant.
Hot and dry, thought it was * * *
Every movement
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20 10 Shunyi second mode chemistry answer Shunyi district 20 10 third grade second unified exercise.
Answers to chemistry test papers
1. Multiple-choice questions (all are single-choice questions, each item is 1 point, ***25 questions, ***25 points).
The title is123455678 91110213.
Answer D B A D B C B C D C A C A
Title:141516171819 202122 23 24 25.
Answer D A D B D B B C A C C B
Second, fill in the blanks (***5 questions, ***30 points)
26.(6 points) 1 minute per grid.
( 1)①D； ② Vitamins
(2) A.D.
(3) three; 27: 16
(4)
27.(5 points) 1 minute per grid.
( 1)C
(2) cooling (adding solute and evaporating solvent)
(3) When bubbles appear, magnesium strips gradually disappear and give off heat; a； Bachelor of science
28.(7 points) 32 points, 65438+ one correct answer 0 point, and all correct answers 2 points. Other per space 1 point.
(1) activated carbon adsorption tank or (4)
(2)①+4 ② Method ③ABC
(3) ① C2 does not meet the requirements
29.(7 points) The last space in each equation is 1 minute, and the other spaces are 1 minute.
(1)A (2) contact with air and water; There are bubbles coming out.
(3)① filtering; (2) copper sulfate and sulfuric acid;
③ Iron+sulfuric acid = ferrous sulfate+H2 = iron+copper sulfate = copper+ferrous sulfate.
30.(5 points) 1 minute per grid. Other reasonable answer scores
( 1)CaCO3； caustic soda
(2) Calcium hydroxide+sodium carbonate = calcium carbonate ↓+2 sodium hydroxide
(3)CH4+2o O2 CO2+2H2O
(4)CO2+Ca(OH)2=CaCO3↓+H2O
Third, the experimental questions (***3 small questions, *** 19 points)
3 1.(7 points) 1 minute per grid.
( 1) 1:2，2H2O 2H2↑+O2↑
(2) Exhaust the air in the glass tube to avoid explosion; 3CO+fe2o 3 3CO 2+2Fe； Controlling carbon monoxide in tail gas to avoid air pollution.
(3)CO2+H2O = h2co 3； Carbon dioxide can't discolor purple litmus.
32.(6 points) 1 minute per grid.
( 1)A； CaCO3+2HCl = CaCl 2+CO2↑+H2O
(2) removing hydrogen chloride that may be contained in carbon dioxide.
(3)NaOH solution; Take off the gas container and put the stick with Mars in the bottle. The stick will be rekindled, which proves that it is oxygen.
(4) The gas flowing into device E contains water vapor, which may react with potassium hydroxide to generate oxygen; Add a washing tank with enough concentrated sulfuric acid between d and e.
33.(5 points) Score for other reasonable answers.
fe2o 3+6nh 2 so 3H = 2(nh2so 3)3Fe+3h2o
Experimental operation, experimental phenomenon and experimental conclusion
The composition of white solid is not calcium carbonate and quartz sand.
Take the above solution and add the purple litmus test solution dropwise, and the purple litmus test solution turns blue.
In addition, take a small amount of white solid in the test tube and add dilute hydrochloric acid dropwise. The composition of white solid is sodium carbonate or sodium bicarbonate.
What are the chemical properties of sodium carbonate and sodium bicarbonate (or the chemical equation in which sodium bicarbonate can react with calcium hydroxide)?
Fourth, the calculation questions (***2 questions, ***6 points. The calculation result should be retained to one decimal place)
34.(3 points)
Let the mass of absorbed water be x.
Calcium oxide+H2O == calcium hydroxide
56 18
16.8g x .....................................................1min.
.................................... 1 min.
X = 5.4g ........................................................1min.
Answer: (omitted)
35. Solution:
(1) 50g .........................................1min.
(2) let the mass of calcium chloride in the solution be x.
Sodium carbonate+calcium chloride = calcium carbonate ↓+sodium chloride
106 1 1 1
2 1.2%×25g x
X = 5.55g .............................................. 1 min.
C% = ................................1min.
A: Omit.
20 1 1 junior two-model Shunyi physics examination questions and answers. Dongcheng District, Beijing 2010-201comprehensive exercise in the second semester and junior three of the school year (II)
Reference answer of physics test paper
First, multiple-choice questions (2 points for each question, ***24 points. Wrong choice, multiple choices do not score)
The title is123455678911112.
Answer d d d d b b c d b b b b c
Second, multiple-choice questions (3 points for each question, *** 12 points. If you choose the right one but not all, you will get 2 points, and if you choose the wrong one, you will not get extra points)
Title13141516
Answer B D A D B C A B C
Three. Fill in the blanks (2 points for each blank, *** 14 points)
The answer to the question [Source: Subject Network] score
17 65 2
18 is less than 2.
19 7. 1× 107 2
20 150 2
2 1 is greater than 2.
22 50 2
23 2.4× 103 2
Four, experiment and inquiry questions (***34 points)
24.(2 points) 0. 18
25.(2 points) Omit.
26.(2 points) 24
27.(2 points) G =(9.8N/kg)m or G =9.8m (N).
28.(3 points) (1) Vacuum cannot transmit sound (2) Liquid density.
(3) Under the same current, the more turns of the coil, the stronger the magnetism.
29.(2 points) B candles are equal.
30.(2 points) Subtract 30.
3 1.(4 points) (1) Sketch (2) Small light bulb (3) Right (4) 0.5
32 .(4 points) (1) Resistance (2) Current (3) Remove flask B and close switches S 1 and S2; (or take off flask B, connect flask A and flask C in series, and turn off switch S2) Weigh water and liquid to be measured with a balance.
33.(3 points) (1) When the speed is the same, the greater the mass of the object, the greater the kinetic energy.
(2) When the mass is the same, the greater the speed of the object, the greater the kinetic energy.
34.(2 points) Hang 1 hook code under the moving pulley, pull the rope end vertically and evenly with a zero-setting spring dynamometer, record the rope end moving distance s and hook code moving distance h, hook code mass m and spring dynamometer indicator f, and use the formula η=W /W total =mgh/Fs to find the mechanical efficiency η1of the pulley block; Increase the hook code and measure the mechanical efficiency η2 by imitating the above method. η 1 is not equal to η2, which shows that Xiao Liang's view is incorrect.
35.(6 points) Experimental steps:
(1) Record the distance L0 of OB, the distance L of AO and the gravity G0 of hook code when the lever is balanced; The graduated cylinder scale V0 corresponding to the water surface is in the table; ( 1)
(2) Move the cylinder below the measuring cylinder, and adjust the length of the thin iron wire so that a part of the cylinder is immersed in water. At this time, the scale of the measuring cylinder corresponding to the water surface is V 1. Adjust the position of the left suspension point of the lever to A 1, so that the lever is balanced in the horizontal position. The distance of A 1O is L' 1, and set L' 1 and L' 1. ( 1)
(3) Change the immersion volume of the cylinder in turn, do five experiments as in step 2, and record the times V2, V3, V4, V5, V6 and L'2, L'3, L'4, L'5 and L' 6 in the table; ( 1)
(4) According to, according to the lever balance condition, cylinder G =; (1 min), and calculate the cylinder's f float 1, f float 2, f float 3, f float 4, f float 5 and f float 6, and record them in the table. ( 1)
(If other answers are correct, you can score accordingly. )
Record Table of Experimental Data (1 min)
G0/N
V0/m3
Volts per cubic meter
Vertical line/cubic meter
10/ m
L/m
L'/m
F floating /N [Source: Subject Network ZXXK]
V. Calculation problem (* *16)
36.q suction = c water m (t-t0) ................................. (1min)
= 4.2× 103j/(kg·℃)×20k g×(t-25℃)...................( 1)
=2.52× 106J
T = 55℃ ....................... (1min)
37. Solution: When S2 is closed and S 1 is open, the equivalent circuit is shown in figure1; When P is in B, close S 1 and open S2. The equivalent circuit is shown in Figure 2. When P is disconnected at C, S 1 and S2, the equivalent circuit is shown in Figure 3. ..................... (1 min)
..................................( 1)
..................... (1 min)
(1 min).
…………………………………③
......................................( 1)
..................................( 1)
The solution 34⑤:................( 1 min) can be obtained.
38. Solution: (1) According to Archimedes' principle: …………………………… (1).
(2) When A is completely immersed in water: stress analysis diagram ............................................ (1 min).
The stress analysis of a and pulley C is shown in figure 1 (a): ................ (1).
The force analysis of moving pulley d is shown in figure 1 (b): ..............................
The stress analysis of lever MN is shown in figure 1(c).
The stress analysis of B is shown in figure 1 (d): .............. (4).
When a happens to be completely out of the water:
The force analysis of a and moving pulley c is shown in fig. 2 (a)
The force analysis of the moving pulley D is shown in Figure 2 (b): [6].
The stress analysis of the lever MN is shown in Figure 2(c).
The stress analysis of B is shown in Figure 2 (d): .....................
And because: .............................
Solution (1) (3) (4) (5) (6) (8) (9) Gain: GA = 600 N .................................................. (1min).
..................... (1 min)
(3) When moving from n to N':
The force analysis of a and moving pulley c is shown in fig. 3 (a): .............. ⑾.
The force analysis of the moving pulley D is shown in Figure 3 (b).
The stress analysis of the lever MN is shown in Figure 3(c).
The stress analysis of B is shown in Figure 3 (d): ............... 14.
Solve ⑽ ⑾ ⑿ ⒀ ⒁: f floating 3 = 200 N .................. (1min).
..................... (1 min)
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Shunyi No.2 Chemical 20 12 Grade Three Answers1-5BCABC 6-10CDBCD115AACCB16-20DCBDC21-25CDACD.
for reference only
20 1 1 the second model test questions and answers of chemistry in Jinzhou senior high school entrance examination 8687687686