“crop coal”的概念、定义、翻译、参考文献-科学参考

单词	crop coal
释义	crop coal [`kräp ´kōl] ^{MINING ENGINEERING} Coal of inferior quality found near the surface.
随便看	dead-roast dead room Dead Sea dead sea dead sheave dead short dead soft steel dead space dead spot dead stick dead-stroke dead-stroke hammer dead time dead-time compensation dead-time correction dead track dead water deadweight capacity deadweight gage deadweight tonnage dead well dead wood dead work dead wraps dead zone

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