【单选题】
根据煤矿地质工作规定当巷道不能揭露煤层全厚时,较稳定煤层探测煤层全厚的观测点间距为___m。
A. 10~25
B. 20~35
C. 25~50
D. 35~50
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答案
C
解析
暂无解析
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