He has worked at the coal face for eight hours.

这矿工在工作面上已经干了八小时了.

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The safe monitoring system on coal face is the nerve of safe production coal mine.

综采工作面的安全监测系统是煤矿生产的神经系统.

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Coal rock body electric characteristic abnormity of the mine coal face relates coal mine safety production.

矿井工作面煤岩体的电性特征异常关系到煤矿安全生产.

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Air leak seriously influences coal face supersedure at second air road of Dongyi mining area.

东一采区二段风道小井漏风严重影响了采煤工作面的接续,制约采区巷道维修.

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