单选题Which of the following problems is the main source of fuel pump and injection system malfunctions?（）AImproper lubricationBAir in the fuel systemCCoated fuel linesDExcessive vibration
单选题
Which of the following problems is the main source of fuel pump and injection system malfunctions?（）
A
Improper lubrication
B
Air in the fuel system
C
Coated fuel lines
D
Excessive vibration
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