单项选择题

Forces within a drilling unit have caused a difference between the starboard and port drafts. This difference is（）.

A.list
B.heel
C.trim
D.flotation

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For the purpose of training and drills，if reasonable and practicable，rescue boats on an OSV must be launched with their assigned crew（）.

A.once a week
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D.either "A" or "B"