The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）
- Avarying the pump discharge pressure
- Bvarying the pump return pressure
- Crotation of the pump plunger
- Drotation of the pump barrel
问题
The amount of fuel delivered by a heli
参考解析：
分类：船舶电气与船舶安全题库
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