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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶动力装置

单项选择题

The successful operation of any engine or machine and （） depend on effective lubrication.

A.their no trouble period
B.their freely trouble period
C.its free trouble life
D.its trouble-free life

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