A.463QS B.464QS C.465QS
A.電空位制動缸不保壓 B.空氣位制動缸不保壓 C.電空位與空氣位制動缸均不保壓
A.緩解電空閥故障 B.壓力開關(guān)209故障 C.制動電空閥故障