单选题At sea，on what occasion would you display two red lights at night or two black balls during the day?（）.AWhen vessel is on fireBWhen vessel is not under commandCWhen vessel is carrying the dangerous cargoesDWhen vessel is restricted in her ability to maneuver
单选题
At sea，on what occasion would you display two red lights at night or two black balls during the day?（）.
A
When vessel is on fire
B
When vessel is not under command
C
When vessel is carrying the dangerous cargoes
D
When vessel is restricted in her ability to maneuver
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