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It is necessary for us （） after having served for a certain period.

单选题
2022-01-03 19:27
A、to change the lube oil
B、have the lube oil purified
C、have the lube oil burnt
D、to analyze the lube oil
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正确答案
D
试题解析
标签： 船舶动力装置 海船船员考试
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