单项选择题
Which of the listed burning materials would be described as a class "B" fire?（）
A.Acetylene B.Lube oil C.Grease D.All of the above
单项选择题 If an oil spill occurs on deck, you should （）.
单项选择题 Fire detecting systems on merchant vessels may be arranged to sense （）.
单项选择题 On a tank vessel, which of the following substances would be burning in a class "B" fire?（）
