单选题In a common rail engine, the fuel is injected into cylinders()Aby injection pumpsBat a time decided by the injection pump timingCby a signal opening the magnetic valvesDat a time decided by the cam directly

单选题
In a common rail engine, the fuel is injected into cylinders()
A

by injection pumps

B

at a time decided by the injection pump timing

C

by a signal opening the magnetic valves

D

at a time decided by the cam directly


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