A.2440转 B.1880转 C.1440转 D.1100转
A.0.1 B.0.2 C.0.3 D.0.5
A.0.08 B.0.1 C.0.12 D.0.15
A.4.750 B.4.745 C.4.742 D.4.740
A.180转 B.288转 C.360转 D.500转