单项选择题
If ignited, which of the listed materials would be a class "B" fire?（）
A.Magnesium B.Paper C.Wood D.Diesel Oil
单项选择题 Which statement concerning the collection of fresh water is FALSE?（）
单项选择题 The class of fire on which a blanketing effect is essential to extinguish the fire is （）.
单项选择题 Which of the listed classes of fire is considered as one involving electrical equipment?（）
