单选题The major cause of problems occurring with fuel injection equipment is（）Aincorrect replacement of barrels and plungers of jerk pumpsBoverheating of the nozzle orificesCcracked pump housingsDdirt in the fuel
单选题
The major cause of problems occurring with fuel injection equipment is（）
A
incorrect replacement of barrels and plungers of jerk pumps
B
overheating of the nozzle orifices
C
cracked pump housings
D
dirt in the fuel
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