题目内容

正应力极值所在截面的切应力一定为零。

A. 对
B. 错

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He kept complaining about everything, which really ______ us.

A. annoyed
B. annoys
C. annoying
D. annoy

People with high EQs often have positive _______ towards life.

A. gratitude
B. attitudes
C. appointment
D. altitude

All of us change our _______to fit different situations.

A. bestow
B. behave
C. behavior
D. beneath

_______ is thought to be a matter of course in many countries.

A. Punctuality
B. Punctual
C. Puncture
D. Punish

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