1. Look at your zipper. If there are three letters YKK on it, it means that it is the product of Yoshida Industrial Co., Ltd., the largest zipper manufacturer in the world. 40% of McDonald's profits come from the sale of Happy Meals. 3. 1996 Webster's dictionary has 3 15 spelling mistakes. 4. On average, 12 newborns are given to the wrong parents every day. 5. Chocolate is for dogs. It is fatal, and it only takes a few ounces to kill a puppy because of heart and nervous system damage. 6.65438+ In 1930s, tomato sauce was sold as a medicine. 7. Da Vinci could write with one hand. At the same time, he painted with his other hand. 8. Scissors were invented by Da Vinci. 9. It took Leonardo da Vinci 65,438+00 years to draw the lips of the Mona Lisa. 65,438+00. The Oscar prizes awarded during World War II were all made of wood, because metal was a scarce material at that time. There are no clocks in casinos in Las Vegas. 65,438+02. Bruce Lee moves too fast to see clearly. Therefore, when we are filming, we have to slow down the speed of the film. Lie on your back and lift your legs slowly to avoid falling into quicksand. 14. Mosquito repellent water does not repel mosquitoes, but interferes with the sensory organs of mosquitoes, making them unable to find people. 15. The dentist suggested that the toothbrush should be placed at least 6 feet away from the bathroom. Avoid all kinds of particles 16 floating in the air when flushing the toilet. The earliest product with bar code was Wrigley Gum 17. Michael Jordan earns more money from Nike every year than the total wages of Nike factory workers in Malaysia 18. Marilyn Monroe has six fingers on one foot 19. Hitler's mother once considered abortion. However, it was discouraged by the doctor. 20. People will lose 40 pounds of skin in their lifetime. 2 1. If you are accidentally bitten by a crocodile, you will poke it in the eye. It will let you go. 22. People can fall asleep in an average of 7 minutes. 23. In the Philippines, yo-yo was used as a weapon. 24. Cats are the only domestic animals that are not mentioned in the Bible. 25. Rubber bands can be better stored in cold storage. 26.56% of keyboard input is done by the left hand. "Dream" is the only English word ending in "mt". 28. Even without a head, cockroaches can still live 10 days. 29. I can't keep my eyes open when sneezing. 30. Mexico City sinks by 65,438+00 inches every year. The brain is more active when sleeping than when watching TV. 32.80% of Americans like blue best. There are more chickens than people on this planet. 34. Thumb nails grow slowest. The fingernails of the middle finger grow fastest. 35. In Washington, DC, there are more telephones than people. The total assets of the poorest countries are not as good as those of the three richest families in the world. 37. The first boss of Marlboro Cigarette Company died of lung cancer. 38. Smart people's hair contains more zinc and copper. 39. The youngest parents in the world are 19 10 China children aged 8 and 9.

But the nose and ears have been growing 465,438+0. Sleeping consumes more calories than watching TV. 42. People will die if they don't sleep for about 10 days. 43. Chewing gum when cutting onions won't make them cry. 43. The Mona Lisa has no eyebrows. 44. If the moon is just above your head, you will lose a little weight. 45. alexander bell, who invented the telephone, never called his mother or wife. Because they are all deaf. 47. "I am." It is the shortest complete sentence in English. 48. Like fingerprints, everyone's tongue lines are different. 49. "Bookkeeper" is the only word in English whose letter is repeated three times in a row. 50. Right-handed people live an average of nine years longer than left-handed people. 5 1. "The quick brown fox jumps over the lazy dog" uses all the letters in English. 52. If all China people line up, the line will never end because of the high birth rate. 53. The number of people using English in China is 54 more than that in the United States. * * Every square inch of skin contains 20 feet of blood vessels. 55. People use the toilet six times a day on average. 56. A baby has 300 bones at birth, and only 206 bones after birth. 57. Beard is the fastest growing hair. If a person never repairs his face, he will grow a 30-foot beard all his life. 58. Which came first, the chicken or the egg? According to Genesis 1:20-22, there was a chicken first. 59. The longest place name still in use today is:-,a hill in New Zealand. 60. If you leave Tokyo by plane at 7: 00 in the morning, when you arrive in Honolulu, it will be 4: 30 yesterday afternoon, 6 1. Scientists at the Park Observatory in Australia believe that they have received information from outside the earth. I found that the radio waves actually came from a microwave oven in the Observatory. 62. Wearing earplugs for an hour will increase the number of bacteria in your ears by 700 times. 63. A French kiss can exchange more than 40,000 kinds of parasites and 250 kinds of bacteria. 64. Men have better eyesight than women. Women have better hearing than men. 65. Coca-Cola was originally green. 66. The most common name in the world is * * * * 67. If you don't count "North" and "South", in English, the initials of seven states are the same. On average, every American has two credit cards. 69. "Typewriter" is the longest English word that can be written with a single-line key on a QWERTY keyboard. 70. Blind women are twice as many as men. 7 1. People don't suffocate. 72. When sneezing, the heart will stop beating about 1 millisecond. 73. Pigs can't see the sky. "Six sick chiefs are sick" is the most tongue twister in English. 75. Sneezing too hard will crack your ribs. Trying to resist sneezing will rupture the blood vessels in the neck or skull, which will be fatal. 76. Each suit of K in playing cards represents a great king in history: King David in spades, Alexander the Great in clubs, Charlemagne in hearts, and Julius Caesar 77.6438+0438+0438+0 in diamonds, 1 15438+0. 1 1 1x 1 1， 1 1， 1 1 1 1 = 65438+。 If the horse flies on all fours, then the man will die in the battle. 79. As above, if a horse's front foot is raised, then the person is seriously injured in the battle. 80. As above, if all four feet of a horse land on the ground, then the person dies of natural causes. 8 1. Honey will not go bad. 82. Crocodiles can't stick out their tongues. Snails can sleep for three years. 84. All polar bears are left-handed.

2.matlab to ask a few small questions (basic questions)

%%% 1 Question% Enter: edit in Matlab, then copy the contents between the following two lines of percent sign, and save%%%%%%%%%%%%%%%%%%% Save x = x0+v0 * t+0.5 * a * t. %%%%% returns to Matlab, input: t = 0: 0.0 1. X = motion (1, 9.8, 0, 0, t); Plot (t, x) XLabel ('t') YLabel ('x')%% 2 Theme subgraph (2,2, 1) ezplot ('sin (2 * x)') xlabel ('sin (2x)) 2) ezplot ('tan (x') xlabel ('x') ylabel ('tan (x')) Subgraph (2, 2, 3) bb = 387cc = 200dd = 500ee = 260pie()； Axis out the third question: r =1; % This can be modified by t = 0: pi/1000:100 * pi; % This can also be x = r * cos (t); y = r * sin(t)； z = t； Et3(x, y, z) is no problem. After my computer runs, there is no problem. Satisfied score ~ ~ Tell me if you are not satisfied. Wow ~ ~ ~ Spring flowers are blooming, laughter and firecrackers are ringing.