单选题Five or more short blasts on a vessel’s whistle indicates that she is（）.AIn doubt that another vessel is taking sufficient action to avoid a collisionBAltering course to starboardCAltering course to portDThe stand-on vessel and will maintain course and speed
单选题
Five or more short blasts on a vessel’s whistle indicates that she is（）.
A
In doubt that another vessel is taking sufficient action to avoid a collision
B
Altering course to starboard
C
Altering course to port
D
The stand-on vessel and will maintain course and speed
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