题目内容

You arewhat you have done.

A. to answer for
B. answered for
C. to be answered for
D. answering for

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He often makes his sister, and this time he is made by his sister.

A. cry…cry
B. to cry…to cry
C. to cry…cry
D. cry…to cry

露天采矿采掘工作方式及铲装设备规格是确定台阶高度的主要因素。

A. 对
B. 错

挖掘不需爆破的土岩时，为了保证工作安全，台阶高度一般不大于机械铲的最大挖掘高度。

A. 对
B. 错

露天矿山采区宽度就是爆破带的宽度（）

A. 对
B. 错