单选题The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）Afuel delivery pressureBpump plunger diameterCplunger control rack positionDtotal pump stroke
单选题
The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）
A
fuel delivery pressure
B
pump plunger diameter
C
plunger control rack position
D
total pump stroke
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