After reporting a casualty to a mobile offshore drilling unit，which record must be retained on board? （）<br>A:Record of drafts<br>B:Hull reports<br>C:Anchor record<br>D:Machinery repair book

After reporting a casualty to a mobile offshore drilling unit，which record must be retained on board? （）
A:Record of drafts
B:Hull reports
C:Anchor record
D:Machinery repair book

出自：海船船员证

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