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

单词	prop-free front
释义	prop-free front Mining noun An area in front of a coalface where no props are placed, so as to leave access for a mechanical conveyor, the roof being supported by cantilever bars; the system of supporting a roof in this way. Origin 1950s.
随便看	Majorana force Majorana neutrino Majorana particle majorant majorat majoration major axis Majorca Majorcan major circle major diameter major-domo major-domoing major element majorette major general major histocompatibility complex major histocompatibility locus majorise Majorism majoritarian majoritarianism majorite cineraria cinerarium

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prop-free front