单项选择题
A.500V B.220V C.110V
A.152x125 B.125x152 C.412x125 D.125x250
A.0.15-0.20 B.0.25-0.30 C.0.30-0.35 D.0.40-0.45
A.直齿圆柱齿轮 B.蜗轮蜗杆 C.锥齿轮 D.带传动
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