單項選擇題

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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單項選擇題

The shipper must（）in a suitable manner dangerous goods as dangerous.

A.mark or label
B.write or sign
C.type or stamp
D.print or paint

單項選擇題

The nozzle of a gasoline hose or can should be kept（）.

A.in contact with the fill opening to guard against static spark
B.from making contact with the fill opening to guard against static spark
C.in contact with the fill opening to allow proper venting
D.None of the above