单选题The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.AcrankshaftBcamshaftCpiston rodDrack and pinion
单选题
The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A
crankshaft
B
camshaft
C
piston rod
D
rack and pinion
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