The canvas covering of fire hose is called the（）.

The brickwork surrounding the firebox of a boiler is known as（）.

A.refractory
B.the screen wall
C.the water wall
D.fire plate

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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

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