地下矿监，值班班长，或煤矿主管需要省级认证。
Provincial certification as an underground mine supervisor, shift boss, or coal mining supervisor may be required.
简要探讨了高压水射流清洗技术在煤矿主排水管道清洗中的应用。
In this paper the application of high pressure water jet technology in coal mine main drainage pipeline is discussed briefly.
煤矿主扇风机的主要功能是保证井下空气畅通新鲜，降低瓦斯浓度。
The function of the main fan in coal mine is to keep fresh air and reduce the concentration of gas.
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