A.CO2 does not cool the fire
B.cylinders are regulated pressure vessels
C.C02 is not effective on class B fires
D.C02 is not effective on class C fires
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A.water-tight
B.air-tight
C.fire-tight
D.oil-tight
A.should
B.shall
C.that
D.if
A.casing
B.outer hose
C.line cover
D.jacket
A.refractory
B.the screen wall
C.the water wall
D.fire plate
A.the accumulation of explosive gases
B.faster cooling of the fire
C.the fire to spread through the ventilation system
D.fixed foam systems to be ineffective
最新試題
Operation of the valve control release on a fixed CO2 system must immediately（）.
The canvas covering of fire hose is called the（）.
Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.
On a ship，when may a work vest be substituted for a required life preserver?（）
One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.
The collision bulkhead shall be of（）.
One advantage of the all-purpose nozzle is that it（）.
Removing which will extinguish a fire?（）.
Each crewmember has an assigned firefighting station. This assignment is shown on the（）.
The BEST method of applying foam to a fire is to（）.