The opening or closing of the cylinder sta
问题:
The opening or closing of the cylinder starting valve is controlled by ().
A.the starting air distributor
B.the cut-off valve on the air main
C.the main starting valve
D.the air bottle control valve
The opening or closing of the cylinder starting valve is controlled by ().
A.the starting air distributor
B.the cut-off valve on the air main
C.the main starting valve
D.the air bottle control valve