A.制動效率50% B.結(jié)構(gòu)緊湊 C.制動效率70% D.制動效串60%
A.3000N,s/cm B.2000N·s/em C.1000N·s/em D.500N·s/cm
A.2mm B.1.5mm C.1mm D.0.5mm