This paper suggests that mining enterprises have to utilize the economic grade which relies on the balance of revenue and expenditure from the view point of maximum utilization of mineral resources.
本文从充分利用矿产资源的角度出发，认为矿山企业运用收支平衡经济品位势在必行。
2
Note: To balance the attention, otherwise Christmas tree is easy grade.
注意：要注意平衡，否则圣诞树很容易倒的。
3
It is proved that balance can reduce much out-of-gauge grade and exceptional length value of uneven freights.