In determining a safe speed（）shall not be among those taken into account.

单项选择题In determining a safe speed（）shall not be among those taken into account.

A.the characteristics，efficiency and limitation of the radar equipment
B.any constraints imposed by the radar range scale in use
C.the effect on radar detection of the sea state，weather and other sources of interference
D.the safe working load of the cranes both on board and ashore

单项选择题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

单项选择题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

单项选择题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

单项选择题When in sight of another vessel，any action taken to avoid collision must（）.

A.be accompanied by sound signals
B.not result in another close quarters situation
C.include a speed change
D.All of the above