单选

Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires___________.

A.grinding the spare plunger to the barrel
B.replacing the plunger and the barrel
C.highly polishing both the plunger and barrel
D.replacing plunger only

试题出自试卷《海船船员考试轮机部三管轮模拟题8(轮机英语)》

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- D.replacing plunger only
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