In determining if risk of collision exists，if there is any doubt，such risk shall be deemed to（）.

In determining safe speed，all of the following must be taken into account EXCEPT the（）.

A.maximum horsepower of your vessel
B.presence of background lights at night
C.draft of your vessel
D.maneuverability of your vessel

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When a vessel sees the other ahead or nearly ahead，by night she could see the masthead lights of the other in a line or nearly in a line or both side lights，（）shall be deemed to exist.

A.head-on situation
B.end-situation
C.crossing situation
D.close-quaters situation

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