Examined by practice, the method about the working condition parameter optimization for coal plough and the calculation about friction force on plow head are feasible.
经实践检验，本文的刨煤机工况参数优化方法和刨头摩擦力计算方法是切实可行的。
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In ancient times, the farmer sowing with the bull to plow before plough their fields, so it is also pay income and the code.