单项选择题
On a tank vessel, which of the following substances would be burning in a class "B" fire?（）
A.Oil B.Wood C.Rags D.Electrical wiring
单项选择题 A class "B" fire would most likely occur in the （）.
单项选择题 The International Oil Pollution Prevention Certificate is valid for a period of （）.
单项选择题 The International Oil Pollution Prevention Certificate required by MARPOL is issued to China flag by the （）.
