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单选题: 3 、设转向系的角传动比为 i w ,转向器的角传动比为 i w1 ,转向传动机构的角传比为 i w2 ,则下式正确的为 ( ) 。A.
i w =i w1 +i w2
B.
i w =i wl ×i w2
C.
i w =i w1 -i w2
D.
i w =i wl /i w2
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