掘进机的爬坡能力一般为12度-15度,在过大的坡度上使用时将失去制动能力而自滑。()
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It is high time we go home.
A B C D
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岩层在外力作用下产生了机械破坏,丧失了连续性和完整性,但是岩层没有发生位移,这种情况不能称岩层产生了断裂。()
Many proposals were raised by the delegates ,as we expected. _____________________________________________________________________________