light-duty roof caving coal
light-duty roof caving coal
轻型放顶煤
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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。
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