单项选择题

The look-out must be able（）full attention to the（）of a proper look-out．

A.to give/keep
B.giving/keeping
C.giving/keep
D.to give/keeping

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单项选择题

She（the vessel）shall if necessary（）and in any event navigate with extreme caution until danger of collision is over.

A.take all her way off
B.take her way all off
C.take her way off
D.take off her all way

单项选择题

SAFE SPEED is defined as that speed where（）.

A.you can stop within your visibility range
B.you can take proper and effective action to avoid collision
C.you are traveling slower than surrounding vessels
D.no wake comes from your vessel