边界品味
参考答案:
划分矿与非矿界限的最低品味。
Passage 3
How much is average per-share earnings for the year as expected by the analysts a. $1.14 b. $1.17 c. $4.65 d. $4.67
为什么对于走向短露天矿,宜采用水平剖面面积法确定开采深度?