單項(xiàng)選擇題A fire hose has a（）.

A.male coupling at both ends
B.female coupling at both ends
C.female coupling at the nozzle end and a male coupling at the hydrant end
D.male coupling at the nozzle end and a female coupling at the hydrant end


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1.單項(xiàng)選擇題A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind（）.

A.blows the fire back toward the vessel
B.comes over the bow
C.comes over the stern
D.comes over either beam

2.單項(xiàng)選擇題A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.

A.alternate expansion and contraction as water in a liquid state becomes a vapor
B.absorption of smoke and gases as water is converted from a liquid to a vapor
C.rapid contraction as water is converted from a liquid to a vapor
D.rapid expansion as water absorbs heat and changes to steam

3.單項(xiàng)選擇題A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.

A.damage from crane operations
B.being used for wash down purposes
C.accidental diversion of flow to wrong location
D.freezing

4.單項(xiàng)選擇題A combustible gas indicator meter is calibrated to read the percentage of（）.

A.vapor to oxygen
B.the flammable limit concentration
C.the autoignition concentration
D.the lower explosive limit concentration

5.單項(xiàng)選擇題A class C fire would be burning（）.

A.fuel oil
B.wood
C.celluloid
D.electrical insulation