A.轉(zhuǎn)速低 B.嚙合平穩(wěn) C.噪音小 D.轉(zhuǎn)矩大,耗電量小
A.30s,5s B.15s,30s C.5s,30s D.5s,15s
A.跳出高壓火 B.有低壓火花 C.無火花出現(xiàn)