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2.

A technician.
B. A mechanic.
C. An engineer.
D. A director.

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3.

A. He wants a raise in salary.
B. He doesn’t like his present employer.
C. He wants a growth opportunity.
D. He has to move to another city.

一点沿某一方向的正应力为零,则沿该方向的线应变也为零。

A. 对
B. 错

强度失效的主要形式有两种,即 和 。

强度理论的任务是用来建立_______应力状态下的强度条件的。

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