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提问人:网友coolshun
发布时间:2022-01-07
[单选题]
中厚煤层(井工开采)的划分标准及其采区回采率规定为()
A.煤层厚度:1.3~3.0m,采区回采率:≥80﹪
B. 煤层厚度:1.3~3.5m,采区回采率:≥80﹪
C. 煤层厚度:1.3~3.5m,采区回采率:≥85﹪
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- · 有5位网友选择 C,占比45.45%
- · 有3位网友选择 B,占比27.27%
- · 有3位网友选择 A,占比27.27%