单项选择题
If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the（）
A.burner valve B.root valve C.quick closing valve D.oil return valve
单项选择题 Spontaneous combustion could occur in（）
单项选择题 All classes of fires can be safely combated using（）
单项选择题 If there were a fire in the bunker tanks, you would（）
