题目内容

下山是沿煤层或岩层从主要运输大巷从()向()开掘的倾斜巷道。

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根据煤层和赋存特征和开采技术条件,煤矿的开采方法有()和()两种。

Wellman was there for his able-bodied friend early in the climb when pieces of rock _______ .

A. made up
B. gave in
C. made out
D. gave way

长用的掏槽方式有(),()和()三种。

回采巷道是指形成()及其服务的巷道。

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