A.Cleaner
B.Effective on metal fires
C.Greater range
D.More cooling effect
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A.conducts electricity
B.should be directed at the base of the fire
C.is most effective on burning gases which are flowing
D.extinguishes by cooling oil fires below ignition temperature
A.meet
B.face
C.be in font of
D.follow
A.meet the applicable standards
B.be marked as additional equipment
C.be stowed in a separate area
D.All of the above
A.Cooling ability
B.Leaves no residue
C.Penetrating power
D.Nonconductivity
A.prevent the generation of flammable or combustible gas in tanks
B.blow out cargo lines to prevent gas concentrations
C.dilute tank atmospheres to keep gas concentrations below the lower explosive limit
D.prevent fires in the pumproom by continually displacing flammable vapors
最新試題
An important step in fighting any electrical fire is to（）.
An aircraft has indicated that he wants you to change course and follow him. You cannot comply because of an emergency on board. Which signal should you make?（）
An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.
Any firefighting equipment that is carried in addition to the minimum required must（）.
As an extinguishing agent，foam（）.
After extinguishing a fire with CO2，it is advisable to（）.
An effective method for moving patients with spinal injuries onto a spine board is known as the（）.
A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.
A vessel is constructed with a steel hull and an aluminum superstructure. Which statement is TRUE?（）
A portable dry chemical fire extinguisher discharges by（）.