单项选择题
A.Length of the discharge pipe B.Height of the discharge pipe C.Difference between the discharge and suction pressures D.Sum of discharge and suction pressures
What does blowing tubes accomplish?（）A.Eliminates unbur...
单项选择题What does blowing tubes accomplish?（）
A.Eliminates unburned fuel oil residues from the firebox B.Increases boiler efficiency C.Flushes away mineral deposits inside the water tubes D.Cleans soot deposits from the inside of the stack
What are the most important reasons for using water fog...
单项选择题What are the most important reasons for using water fog to fight fires?（）
A.Smothers burning surfaces，organically destroys fuel B.Cools fire and adjacent surfaces，provides protective barrier C.Reaches areas not protected by steam or CO2 smothering systems D.Allows fire to be attacked from leeward，saturates liquid surfaces
Weight is considered during the periodic required inspe...
单项选择题Weight is considered during the periodic required inspection and servicing of（）.
A.CO2 (carbon dioxide) fire extinguishers B.foam fire extinguishers C.water (stored pressure) fire extinguishers D.All of the above
