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【简答题】
在图3-1-11所示轮系中,已知各齿轮齿数分别为z 1 =24,z 2 =28,z 3 =20,z 4 =60,z 5 =28,z 6 =20,z 7 =20,求传动比i 17 。若齿轮1的转向已知(见图3-1-11中的n 1 ),试判定齿轮7的转向。
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