單項選擇題The pump has a constant stroke and the amount of fuel delivered is regulated by rotating () which has a specially arranged helical groove cut into it.

A.the pump cylinder
B.the pump cam
C.the pump plunger
D.the pump miler


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2.單項選擇題The process to remove exhaust gases by blowing in fresh air is called ().

A.charging
B.supercharging
C.starting
D.scavenging

4.單項選擇題The primary duty of lube oil is to reduce () between the working parts of an engine.

A.power output
B.friction and wear
C.indicated pressure
D.rated horsepower

5.單項選擇題The pressurized air is usually cooled to increase the charge air ().

A.viscosity
B.density
C.velocity
D.electricity