... basic economic accounting unit 基本经济核算单位 basic economic series 基本经济数列 basic equation 基本等式 ...
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The basic principles and applied conditions of three comparing methods calculating economic stripping ratio are expounded and a series of formulas corresPOnd with the ones are presented in the paper.
阐述了计算经济剥采比三种比效法的基本原理和适用条件。并提出了一套相应的计算公式。
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