单项选择题
Continuous sounding of a fog whistle by a vessel is a signal（）.
A.that the vessel is anchored B.to request the draw span of a bridge to be opened C.of distress D.that the vessel is broken down and drifting
单项选择题 Before entering the chain locker，you should（）.
单项选择题 According（）the report，the ship hit the wharf when berthing.
单项选择题 A vessel showing a yellow light over a white light at night is a vessel（）.
