单项选择题
A.IBC code
B.BC code
C.IMDG code
D.IGC code
单项选择题 The telegram AFTER UNLOADING PROCEED MANILA IN BALLAST indicates that the ship will proceed to Manila（）.
单项选择题 The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads（）.
单项选择题 The shipper must（）in a suitable manner dangerous goods as dangerous.