单项选择题
What is best suited for fighting a fire in a ballast control room?（）
A.Automatic sprinkler system
B.Steam smothering system
C.Dry chemical system
D.Carbon dioxide system
相关考题
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单项选择题
What is an advantage of using foam in fire fighting?（）
A.It is effective in controlling fire in flowing oil such as coming from a broken fuel line
B.It absorbs heat from materials that could cause reignition
C.Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment
D.Once the surface is blanketed with foam and the fire is extinguished，no further foam is required -
单项选择题
What is an advantage of using foam in fire fighting?（）
A.It is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)
B.Most foams can be used with dry chemicals to attack a fire by two methods
C.Foam is effective on combustible metal fires
D.Foam can be made with seawater or fresh water -
单项选择题
What does the term head mean when applied to a fire pump?（）
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
