Economically minable limestone does not occur so frequently.
经济上值得开采的石灰石并不这样多。
Most minable seams are threatened by floor limestone aquifer.
大部分可采煤层受底板奥灰突水威胁。
Calculation Methods of Rational Minable Period of Three Quantities and Their Application
三量合理可采期的计算方法及其应用
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