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
点击查看答案&解析
相关考题
-
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 -
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 -
单项选择题
Water fog from an all-purpose nozzle may be used to（）.
A.fight an electrical fire
B.fight a magnesium fire
C.eliminate smoke from a compartment
D.All of the above
