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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。这个计算方法系统具有形式上的规则性和简明性以及理论上的完善性和系统性。
The basic principles and applicable conditions for calculating the ratio of economic stripping to the ratio of three kinds are compared. And put forward a set of corresponding calculation formula. This method of calculation system has formal rules and conciseness as well as theoretical perfection and systematicness.