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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