单项选择题
A.80% B.90% C.95% D.100%
A.圆柱齿轮 B.圆锥齿轮 C.蜗轮与蜗杆
A.0.005mm B.0.01mm C.0.05mm D.0.1mm
A.40 B.60 C.70 D.80
微信扫一扫,加关注免费搜题