“mine props”的概念、定义、翻译、参考文献-科学参考

单词	mine props
释义	mine props [`mīn ´präps] ^{MINING ENGINEERING} Sections of wood used for holding up pieces of rock in the roof of mines.
随便看	crossed belt crossed cylinder crossed electrophoresis crossed-field accelerator crossed-field amplifier crossed-field backward-wave oscillator crossed-field device crossed-field multiplier phototube crossed lens crossed-needle meter crossed paralysis crossed-pointer indicator crossed prisms cross effect cross-eye cross-fade cross fault cross-fertilization cross fire cross-flow cross-flow baffle cross-flow plane cross flux cross fold crossfoot

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