问题
单项选择题
采煤工作面上端头上方支架至上顺槽上帮,必须留有不少于()宽的人行道,顶、帮至放顶线必须有特殊支护,拉架过程中顶板支护应确保安全可靠
A、0.5
B、0.6
C、0.7
D、0.8
答案
参考答案:C
采煤工作面上端头上方支架至上顺槽上帮,必须留有不少于()宽的人行道,顶、帮至放顶线必须有特殊支护,拉架过程中顶板支护应确保安全可靠
A、0.5
B、0.6
C、0.7
D、0.8
参考答案:C
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