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【单选题】
A 、 B 两对齿轮传动,圆周速度相同,已知其制造精度 A 为 6 级, B 为 8 级,则传动的动载系数 ______________ 。A.
K vA < K vB
B.
K vA = K vB
C.
K vA > K vB
D.
情况不定，尚需考虑其它参数
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