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

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

出自：海船船员证

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