單項(xiàng)選擇題In determining if risk of collision exists，if there is any doubt，such risk shall be deemed to（）.
A.exist
B.exists
C.existing
D.to be existed
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題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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