单项选择题
The canvas covering of fire hose is called the（）.
A.casing
B.outer hose
C.line cover
D.jacket
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The brickwork surrounding the firebox of a boiler is known as（）.
A.refractory
B.the screen wall
C.the water wall
D.fire plate -
单项选择题
The blocking or absence of fire dampers can cause（）.
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 -
单项选择题
The bilge pump on a fishing vessel（）.
A.must be fixed if the vessel exceeds 12 meters in length
B.may be used as a fire pump
C.must be portable if there are more than 4 watertight compartments
D.must be capable of pumping at least 450 gpm
