If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）<br>A:only the replacement of the entire pump would be acceptable<br>B:the injection pump and injection nozzle must be replaced<br>C:either the barrel or plunger must be replaced<br>D:the barrel and plunger must be replaced as a unit

If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）
A:only the replacement of the entire pump would be acceptable
B:the injection pump and injection nozzle must be replaced
C:either the barrel or plunger must be replaced
D:the barrel and plunger must be replaced as a unit

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