“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	combination principle combination reaction combination rig combination saw combination spectrum combination square combination string combination tone combination trap combination unit combination vibration combination wrench combinatorial analysis combinatorial theory combinatorial topology combinatorics combined carbon combined cyanide combined flexure combined footing combined head combined immunological deficiency disease combined moisture combined sewers combined stresses

科学参考收录了103327条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。