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所谓剥采比,即每采【 】煤需要剥离多少立方米的岩石量。
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所谓剥采比,即每采【 】煤需要剥离多少立方米的岩石量。
A、3t
B、2t
C、4t
D、1t
时间:2021-09-01 20:19
关键词:
联大
河南理工大学
采矿学
答案解析
D
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