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【简答题】
在图示轮系中,已知各齿轮的齿数分别为 z 1 =28 , z 3 =78 , z 4 =24 , z 6 =80 ,若已知 n 1 =2000r/min 。当分别将轮 3 或轮 6 刹住时,试求行星架的转速 n H 。
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