A.兩個頭車制動缸 B.主風(fēng)缸管和輔助風(fēng)缸 C.主風(fēng)缸管和制動管 D.頭車動軸和拖軸
A.20s B.30s C.40s D.60s
A.一個 B.二個 C.三個 D.四個