The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）<br>A:the firing pressure in the cylinder<br>B:a metering helix inside the pump<br>C:varying the physical length of the plunger stroke<br>D:varying the clearance between the injector cam and the injector rocker arm

The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）
A:the firing pressure in the cylinder
B:a metering helix inside the pump
C:varying the physical length of the plunger stroke
D:varying the clearance between the injector cam and the injector rocker arm

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