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1·According to this cutoff grade, the paper has calculated the ratio of ore and rock while cutoff drawing that provide science foundation for the drawing of Xiaoguanzhuang iron mine.

据此计算了截止放矿时的矿岩比，为小官庄矿放矿提供了科学依据。

2·According to this cutoff grade, the paper has calculated the ratio of ore and rock while cutoff drawing that provide science fo...

据此计算了截止放矿时的矿岩比，为小官庄矿放矿提供了科学依据。