A.CleanerB.Effective on metal firesC.Greater rangeD.Mor……

单项选择题As an extinguishing agent，foam（）.

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

单项选择题Any ship damaging a pipe could（）an immediate danger of fire.

A.meet
B.face
C.be in font of
D.follow

单项选择题Any firefighting equipment that is carried in addition to the minimum required must（）.

A.meet the applicable standards
B.be marked as additional equipment
C.be stowed in a separate area
D.All of the above

单项选择题Any extinguishing agent used on a Class C fire must have which important property?（）

A.Cooling ability
B.Leaves no residue
C.Penetrating power
D.Nonconductivity

单项选择题An inert gas system on a tanker should be used to（）.

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