试题与答案

岩石在载荷的作用下,改变自己的形状或体积,当载荷去掉后,又能恢复其原来的形状或体积,

题型:单项选择题

题目:

岩石在载荷的作用下,改变自己的形状或体积,当载荷去掉后,又能恢复其原来的形状或体积,这种变形称为()。

A.弹性变形

B.塑性变形

C.流变

D.脆性变性

答案:

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The timing of marriage has varied (59) over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time at an average of five years later than people did in the 1950s. (60) , young adults of the 1950s married younger than did any previous generation in U. S. history.

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A.rate 

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