采煤机直接用于煤炭的地下开采，是煤炭生产中最主要的机械设备之一。
Coal mining machine USES in the coal directly underground mining, is in the coal production one of most main mechanical devices.
通过对行星传动机构的研究分析，说明其在采煤机及其他机械设备中的重要作用。
Through researches and analyses of planet transmission mechanism, this paper stories its important effects on every machinery equipment.
采煤机直接用于煤炭的地下开采，是煤炭生产中最重要的机械设备之一。
Exploit in the mining machine underground used in the coal directly, it is one of the most important mechanical equipment in production on the coal.
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