The color of rockets，shells，or rocket parachute flares used to indicate that the vessel is in distress and requires immediate assistance is（）.<br>A:white<br>B:green<br>C:red<br>D:yellow

The color of rockets，shells，or rocket parachute flares used to indicate that the vessel is in distress and requires immediate assistance is（）.
A:white
B:green
C:red
D:yellow

出自：海船船员证

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