A.25V B.50V C.60V D.100V
A.1000---2000 B.4000---10000 C.500---1000 D.10000---1000000
A.傳動比準(zhǔn)確 B.結(jié)構(gòu)緊湊 C.傳動平穩(wěn) D.效率高