The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）<br>A:varying the pump discharge pressure<br>B:varying the pump return pressure<br>C:rotation of the pump plunger<br>D:rotation of the pump barrel

The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）
A:varying the pump discharge pressure
B:varying the pump return pressure
C:rotation of the pump plunger
D:rotation of the pump barrel

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