单项选择题
Dangerous goods required to be “carried on deck only” should not be carried on closed vehicle decks，but may be carried on open vehicle deck when authorized by the competent authority concerned. （）
A.under deck B.on deck C.ondeck only D.under deck only
单项选择题 Cottonseed oil is classed as a（）.
单项选择题 Corrosive liquids and acids should have what kind of label? （）
单项选择题 COMPATIBILITY OF GOODS states（）.
