单项选择题
Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）
A.Water stream B.Water fog or apray C.Steam D.Dry chemical
单项选择题 When loading or discharging dry mud or cement，crew members should use goggles and（）.
单项选择题 When collecting condensation for drinking water，（）.
单项选择题 When choosing extinguishers to fight a Class “B” fire do NOT use（）.
