When is dock survey carried out?（）<br>A:During annual repair<br>B:Usually during dock repair<br>C:Before sea trial<br>D:After 5 years from last annual survey

When is dock survey carried out?（）
A:During annual repair
B:Usually during dock repair
C:Before sea trial
D:After 5 years from last annual survey

出自：海船船员证

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