题目内容

无荷载作用的梁段上，剪力图和弯矩图分别是什么图形？

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We are well aware of the travel etiquette just like in daily lives.

A. 对
B. 错

You should improve your professional image by extending etiquette to fellow passengers.

A. 对
B. 错

Air travel is the most convenient way in business nowadays.

A. 对
B. 错

It is common to leave your seat during air travel so that you don't need to feel embarrassed to move around.

A. 对
B. 错