The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads（）.<br>A:warning, keep off,stay clear<br>B:danger, do not board<br>C:warning, no smoking, no open lights, no visitors<br>D:dangerous cargo being transferred

The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads（）.
A:warning, keep off,stay clear
B:danger, do not board
C:warning, no smoking, no open lights, no visitors
D:dangerous cargo being transferred

出自：海船船员证

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