单项选择题

A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.

A.remains fully obliged
B.has no obligation
C.is not necessarily
D.is exempted

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A vessel showing a rigid replica of the International Code flag A is engaged in（）.

A.diving operations
B.dredging
C.fishing
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A vessel shall be deemed to be overtaking when she can see at night（）.

A.only the sternlight of the vessel
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