單項(xiàng)選擇題A spanner is a（）.

A.cross connection line between two main fire lines
B.special wrench for tightening couplings in a fire hose line
C.tackle rigged to support a fire hose
D.None of the above


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1.單項(xiàng)選擇題A small fuel spillage has occurred during helicopter refueling. After the leak has been stopped and fire-control personnel have been notified and are standing by，the next step is to（）.

A.proceed with fueling operation
B.have helicopter move to a safer location
C.wash spilled fuel away with a flood of water
D.clean spilled fuel with rags

2.單項(xiàng)選擇題A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.

A.a gas mask certified by the Mine Safety and Health Administration
B.the same self-contained breathing apparatus required with the fireman's outfit
C.an oxygen breathing apparatus，provided that the device has been inspected within three years
D.a portable ventilation system that will provide a complete change of air every three minutes

4.單項(xiàng)選擇題A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.

A.generators
B.oil drums
C.the bridge controls
D.combustible metals

5.單項(xiàng)選擇題A portable dry chemical fire extinguisher discharges by（）.

A.gravity when the extinguisher is turned upside down
B.pressure from a small CO2 cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical