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	Definition of prop-free front in English: prop-free front noun Mining 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. Definition of prop-free front in US English: prop-free front noun Mining 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	perkiness perkiness perkinesses perking perking up Perkinism Perkinistic Perkinite perkin reaction Perkin reaction Perkins, Carl Perkins, Frances Perkin, Sir William Henry perkinsism Perkinsism Perkin's mauve perkin's purple Perkin's purple Perkin's reaction perkin's violet Perkin's violet perkin synthesis Perkin synthesis perkin warbeck perkish

　

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更新时间：2025/11/7 5:01:02