英语词汇“prop-free front”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	prop-free front
释义	prop-free front prop-free front [′präp ‚frē ‚frənt] (mining engineering) In coal mining, longwall working in which support to the roof is given by roof beams cantilevered from behind the working face.
随便看	ajph ajpha ajpherd ajphysics ajpi ajpl ajpm ajpme ajpn ajpo ajpp ajps ajpsir ajpt ajpw aj-q ajq ajqha ajr ajra ajrc ajrca ajrcc ajrccm ajrcmb

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