Whistle signals indicating course changes must be sounded ________.
A.in fog
B.when vessels are in sight of one another
C.when you can be reasonably sure of hearing the other vessel's acknowledgment
D.every time you alter course
正确答案是B
Whistle signals indicating course changes must be sounded ________.
A.in fog
B.when vessels are in sight of one another
C.when you can be reasonably sure of hearing the other vessel's acknowledgment
D.every time you alter course
正确答案是B