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	njccej njccps njccr njcct njccvts njcd njcda njcdc njcdd njcdi njcea njcec njcee njceed njc&egc njceia njcep njcer njcf njcfil njcfsa njcfsc njch njche njchs

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