The Rules state that a seaplane shall ().A.not be regarded as a vesselB.in general keep we

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The Rules state that a seaplane shall ().

A.not be regarded as a vessel

B.in general,keep well clear of all vessels

C.proceed at a slower speed than surrounding vessels

D.when making way,show the lights for a vessel not under command

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热搜:a是b的充分条件,b是a的必要条件吗