题目内容

history man has changed his physical environment in order to improve his way of life.

Along
B. In
C. Since
D. Throughout
E. While

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this time the design of airships was constantly being improved and1937 they carried thousands of passengers on regulartransatlantic services for millions of miles.

A. During / then
B. Until / then
C. During / up to
D. While / until
E. Whenever / until

the surrounding rocks contain copper, the stalactites are green.

A. Whereas
B. Along
C. Whenever
D. Through
E. While

现有两种说法： ①弹性变形中，σ-ε一定是线性关系②弹塑性变形中，σ-ε一定是非线性关系；哪种说法正确？

A. ①对②错
B. ①对②对
C. ①错②对；
D. ①错②错；

两杆几何尺寸相同，轴向拉力F相同，材料不同，它们的应力和变形可能是。

A. 应力σ和变形△ι都相同
B. 应力σ不同，而变形△ι都相同
C. 应力σ相同，变形△ι不同
D. 应力σ和变形△ι都不同