“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	Lepospondyli lepospondylous leproma lepromatous leprosy lepromin leprophobia leprosarium leprosy Leptaleinae Leptictidae leptine Leptinidae leptite Leptocardii leptocephalous larva leptocephaly leptocercal Leptochoeridae Leptodactylidae leptodactylous Leptodiridae leptogeosyncline leptokurtic distribution Leptolepidae Leptolepiformes

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