综采放顶和一次采全高两种采煤方式对煤炭质量影响与效益测算
종채방정화일차채전고량충채매방식대매탄질량영향여효익측산
To Compare Effects of Two Method on Coal Quality and Economic Results between the Fully-mechanized Mining with Roof Caving and the method of One-time Cutting Whole Height
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