A fire in electrical equipment should be extinguished by using（）.

单项选择题A fire in a ballast pumproom can be brought under control with minimal impact on stability by（）.

A.cooling the outside bulkheads with water
B.shutting all sources of air into the compartment
C.closing the sea chest
D.flooding the compartment with salt water

单项选择题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

单项选择题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

单项选择题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

单项选择题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