To avoid scavenge fires occurring the engine timing and equipment maintenance （）.<br>A:should be correctly carried out<br>B:should correctly be taken place<br>C:should carded with care<br>D:must to carry out with great care

To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A:should be correctly carried out
B:should correctly be taken place
C:should carded with care
D:must to carry out with great care

出自：海船船员证

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