The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）<br>A:fuel delivery pressure<br>B:pump plunger diameter<br>C:plunger control rack position<br>D:total pump stroke

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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