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4.3人身检查-初阶-回答问1.What happened in the dialogues?2.How did the agent solve the problem?3. What have you learned from these dialogues?

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4.2随身行李检查-知识拓展1. Why have almost all airports all over the world instituted pre-boarding security checks for weapons?2. What is the point the agent must take about the search?

构件的强度、刚度、稳定性问题均与所用材料的力学性能有关。

A. 对
B. 错

材料力学主要研究弹性范围内的小变形情况。

A. 对
B. 错

根据均匀性假设，可认为构件的（）在各点处相同。

A.应力
B.应变
C.材料的弹性常数
D.位移