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【简答题】
一对直齿圆锥齿轮传动,主动轮 z 1 =17 ,转速 n 1 =800r / min ,从动轮 z 2 =38 。求其传动比 i 12 = ,从动轮转速 n 2 = r/min(保留小数点后一位) 。
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