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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