单项选择题
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
单项选择题 The shipper must（）in a suitable manner dangerous goods as dangerous.
单项选择题 The nozzle of a gasoline hose or can should be kept（）.
单项选择题 The dangerous cargo manifest does NOT indicate（）.
