单选题When you doubt the existence of risk of collision,（）.Asuch risk shall be deemed to existBsuch risk shall not be deemed to existCyou needn't take any action to avoid collision with any vesselDyou should accelerate your speed ahead
单选题
When you doubt the existence of risk of collision,（）.
A
such risk shall be deemed to exist
B
such risk shall not be deemed to exist
C
you needn't take any action to avoid collision with any vessel
D
you should accelerate your speed ahead
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