A.大齒輪移進(jìn) B.大齒輪移出 C.調(diào)換零件 D.修刮軸瓦
A.2 B.4 C.6 D.8
A.1:2~1:6 B.1:8~1:30 C.1:30~1:50 D.1:50~1:80