煤矿开采 [矿业] coal mining

采煤机 [矿业] coal mining machine

采煤方法 [矿业] coal-mining method

水力采煤 [矿业] hydraulic coal mining

井下采煤区 [矿业] underground coal mining district

煤矿事故 [矿业] [安全] coal mining accident

遥控采煤法 [矿业] remote control coal mining

煤矿顶板分级 [矿业] classification of coal mining roof

谐和地压采煤法 [矿业] harmonic coal mining method

短壁采煤法 [矿业] shortwall coal mining method