（）指岩石所承受的应力达到或超过其破裂强度时发生破裂变形而形

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问题填空题

（）指岩石所承受的应力达到或超过其破裂强度时发生破裂变形而形成的构造。

答案

参考答案：断裂构造

单项选择题

With good reasons he is called a fool.

A．With good reasons is he called a fool.

B．He is called fool with a good reason.

C．With good reasons he is called fool.

D．He is called fool with good reasons.

问答题

标准状况下．空气密度为1.293g/L，氧气的密度为1.429g/L，则空气中氧气的质量分数是多少？