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	aciphex sprinkle acipi acipimox acipr acips acips-lt acir acirc a circle jerk a circle-jerk a circle of friends a circumflex a-circumflex acire acireale aci-reale, the diocese of aciri acirl acirrt acirs acirt aciru acis acisa acisam

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