“second mining”的概念、定义、翻译、参考文献-科学参考

单词	second mining
释义	second mining [`sek·ǝnd `mīn·iŋ] ^{MINING ENGINEERING} In underground coal mining, a procedure in which the pillars left for roof support are removed as mining operations move back out of the previously mined area.
随便看	direct input/output direct-insert subroutine direct instruction direct interelectrode capacitance direct inward dialing direction directional antenna directional beacon directional beam directional control directional control valve directional counter directional coupler machine code machine conditions machine controlled time machine cut machine cycle machine-dependent machine design machine drill machine element machine error machine file machine forging

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