问题
单项选择题
图示梁，当力偶Me的位置在梁的AB段内改变时，下列结论正确的是（）。
A．剪力图、弯矩图都改变
B．剪力图不变，只弯矩图改变
C．弯矩图不变，只剪力图改变
D．剪力图、弯矩图都不变
答案
参考答案：B
解析：
集中力偶只影响弯矩图， 当有集中力偶作用时弯矩图发生突变。
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图示梁，当力偶Me的位置在梁的AB段内改变时，下列结论正确的是（）。
A．剪力图、弯矩图都改变
B．剪力图不变，只弯矩图改变
C．弯矩图不变，只剪力图改变
D．剪力图、弯矩图都不变
参考答案：B
解析：
集中力偶只影响弯矩图， 当有集中力偶作用时弯矩图发生突变。
| 选择单词，用其适当的形式填空，使短文意思正确、通顺。（每词限用一次） | |
They don't (2)________ to find food for themselves. They just eat, walk and sleep all day. So many of us think that the animals there (3)________ happy. But most of them are sad. Why? They aren't (4)________! Animals (5)________ monkeys and tigers usually live freely and (6) ________ in forests or mountains. Tigers, for example, run, jump and play with their (7)________ and catch small animals for food. But now they have to (8)________ in the small rooms in the zoo. Their life there is (9)________ from their life in the forests. Now all of us think animals should go (10)________ to the forests. Do you think it is true? |