This paper introduces the design of light-duty roof caving coal hydraulic support equipped with flat tramcar and transportation on ground and under ground.
介绍轻型放顶煤液压支架(下文简称轻放支架)配套平板车的设计过程及轻放支架在煤矿地面、井下的运输过程。
Ennis stood as if heart-shot, face grey and deep-lined, grimacing, eyes screwed shut, fists clenched, legs caving, hit the ground on his knees.
埃尼斯的心被狠狠地击中了。 他面如死灰，表情扭曲，闭上了眼睛。 双拳紧握，两腿一软，重重地跪在地上。
The result showed that the mined-out area can not induce impact ground pressure hazard, but partial caving may occur.
结果表明：该采空区不会发生冲击地压灾害，但可能发生局部冒顶。
应用推荐