单项选择题
The best method of extinguishing a class A fire is to（）.
A.remove oxygen from the area B.cool fuel below ignition temperature C.smother with CO2 D.smother fire with foam
单项选择题 The BEST method of applying foam to a fire is to（）.
单项选择题 The atmosphere in a tank is too lean if it is（）.
单项选择题 The all-purpose nozzle will produce a fog spray when you（）.
