A vessel sounds one short blast.This signal indicates the vessel ().A.intends to alter cou

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A vessel sounds one short blast.This signal indicates the vessel ().

A.intends to alter course to starboard

B.intends to pass starboard to starboard

C.is altering course to starboard

D.intends to pass port to port

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热搜:a是b的充分条件,b是a的必要条件吗