“prop-free front”的概念、定义、翻译、参考文献-科学参考

单词	prop-free front
释义	prop-free front [`präp ´frē ´frǝnt] ^{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	homopolar crystal homopolar generator homopolar machine homopolymer homopolymer tail homopolysaccharide Homoptera Homo sapiens homoscedastic Homosclerophorida homoserine homosexual homosexuality homosexual panic homosphere homospory homothallic homothetic curves homothetic figures homothetic ratio homothetic transformation homotopy homotopy groups homotopy theory homotropic enzyme

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