It is difficult to establish a simple model which the mathematic or mechanical method can be used in the selection lf mining method, due to many influence and constraint factors.
由于采矿方法选择受诸多因素影响和制约，难于建立一个用数学或力学模型的方法加以处理。
It is difficult to establish a simple model which the mathematic or mechanical method can be used in the selection lf mining method, due to many influence and constraint factors.
由于采矿方法选择受诸多因素影响和制约，难于建立一个用数学或力学模型的方法加以处理。
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