约束反力的方向总是和该约束所能阻碍物体的运动方向相同。 - 查题网

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成人高等教育 / 建筑力学

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约束反力的方向总是和该约束所能阻碍物体的运动方向相同。

A、正确
B、错误

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建筑力学

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1[填空题] When you wave (挥手) to a friend, you are using sign language. When you smile at someone, you mean to be 21 . When you put one finger (手指) in front of your 22 , you mean "Be quiet." Yet, people in different countries may use different sign languages. Once an Englishman was in Italy. He could speak 23 Italian. One day while he was walking in the street, he felt 24 and went into a restaurant (餐馆). When the waiter came, the Englishman 25 his mouth, put his fingers into it and took them out again and moved his lips (嘴唇). In this way, he 26 to say, "Bring me something to eat." But the waiter brought him a lot of things to 27 . First tea , then coffee, then milk, but no food. The Englishman was 28 that he was not able to tell the waiter he was hungry. He was 29 to leave the restaurant when another man came in and put his hands on his stomach (肚子). And this sign was 30 enough for the waiter. In a few minutes, the waiter brought him a large plate of bread and meat. At last the Englishman had his meal in the same way.21. A. nice B. friendly C. fine D. well 22. A. eye B. hand C. mouth D. arm 23. A. a little B. few C. a few D. little 24. A. hungry B. tired C. sad D. worried 25. A. washed B. opened C. closed D. touched 26. A. dared B. meant C. had D. decided 27. A. eat B. drink C. carry D. play 28. A. happy B. glad C. sorry D. afraid 29. A. quick B. slow C. ready D. quiet 30. A. clear B. bad C. bright D. wrong 大学英语I

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