单项选择题
In the fire main system, quick cleaning strainers are located at the（）.
A.pump suctions B.pump discharge C.fire hydrants D.hose nozzle
单项选择题 Where should muster lists be posted?（）
单项选择题 The best method of extinguishing a class A fire is to （）.
单项选择题 When approaching a fire from win ward, you should shield firefighters from the fire by using（）
