选择题:对重力运搬叙述不正确的是( )A..应用空场法采矿时,矿体倾角大于50°~55°,方能考虑应用重力运

题目内容:
对重力运搬叙述不正确的是( )
A..应用空场法采矿时,矿体倾角大于50°~55°,方能考虑应用重力运搬;
B.应用崩落采矿法时,矿石能沿65°~80°倾斜面借重力向下滚动
C..采场矿石重力运搬时受矿体倾角影响很大,因此水平矿体不能采用重力运搬方式;
D.溜井中重力运搬,其倾角一般不小于55°~60°
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