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	sistp sistr sistren sistroid sistrum sistrunk sistrunk band retractor sistrunk dissecting scissors sistrunk double-ended retractor sistrunk operation sistrunk procedure sistrunk retractor sistrunk scissors sistrunk, walter ellis sistrurus sistrurus catenatus sistrurus catenatus catenatus sistrurus catenatus consors sistrurus catetanus sistrurus miliaris sistrurus miliarius sistuhs sisu si suggestio non sit vera sisum

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