煤矿企业安全生产

《质量标准化标准》规定：采煤工作面在用支柱要( )。

发布于 2021-03-23 18:25:00

【多选题】
A 完好
B 不漏液
C 不自动卸载
D 无外观缺损

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漏顶如不及时处理，会使( )煤层顶板岩石继续冒落。

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采空区处理方法有( )

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