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采煤工作面矿压观测目的任务是
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采煤工作面矿压观测目的任务是
A、掌握上覆岩层运动规律
B、对直接顶分类,老顶分级
C、对机构设备进行评估
D、确定采动影响范围
时间:2021-09-03 16:51
关键词:
联大
河南理工大学
矿山压力及其控制
答案解析
A@#@B@#@C@#@D
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