题目内容

What is the present value of the houseyou have made a new decoration

A. while
B. since
C. when
D. until
E. after

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

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

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；