“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	wave vector wave-vector space wave velocity wavy extinction wax wax-block photometer wax-coating machine wax distillate waxed paper wax engraving wax fractionation wax gland waxing moon wax manufacturing wax master wax original wax stain wax tailings waxy waxy-electrolyte battery way point ways Wb W boson W coefficient

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