“transition from surface mining to underground mining”的概念、定义、翻译、参考文献-科学参考

单词	transition from surface mining to underground mining
释义	transition from surface mining to underground mining Encyclopedia 工学露天与地下联合开采释 transition from surface mining to underground mining露天转地下开采前期用露天采矿法开采矿床上部矿体，然后过渡到用地下采矿法开采矿床下部矿体的开采方式。
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