You see a vessel carrying a black diamond which indicates a（）.<br>A:vessel towing astern<br>B:barge pushed ahead<br>C:vessel towing astern only when the length of her tow exceeds 200 meters<br>D:this signal does not exist in international waters

You see a vessel carrying a black diamond which indicates a（）.
A:vessel towing astern
B:barge pushed ahead
C:vessel towing astern only when the length of her tow exceeds 200 meters
D:this signal does not exist in international waters

出自：海船船员证

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