Objective:To evaluate improved drainage method in pit operation.
目的：评价改良引流法用于肛肠术后的临床价值。
The crusher is the key technology for semi-continued overburden stripping operation in open pit mine.
实现露天矿表土剥离采用半连续工艺的关键技术是破碎机。
Rain has serious effect on the operation of long and narrow deep open pit.
降雨对狭长深凹露天矿的生产有严重的影响。
Rain has serious effect on the operation of long and narrow deep open pit.
降雨对狭长深凹露天矿的生产有严重的影响。
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