“helper set”的概念、定义、翻译、参考文献-科学参考

单词	helper set
释义	helper set [`hel·pǝr ´set] ^{MINING ENGINEERING} A set of timbers to reinforce the normal set of timbers in a mine.
随便看	yellow pyrite yellow quartz yellows yellow salt yellow scale Yellow Sea yellow snow yellow tellurium Yerkes system yew Y factor Y fitting Y gun yield yield factor yielding arches yielding floor yielding prop yield-pillar system yield point yield rate yield strength yield stress yield temperature yig

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