单选题The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads（）.Awarning, keep off,stay clearBdanger, do not boardCwarning, no smoking, no open lights, no visitorsDdangerous cargo being transferred
单选题
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
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