航海英语应急预案与EMS单项选择题每日一练(2018.12.14)

单项选择题
Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）
A.Leaves a residue
B.Cost，relative to other agents
C.Breaks down while under prolonged storage
D.Conducts electricity
单项选择题
When should a fire be ventilated?（）
A.When attacking the fire directly
B.When using a steam smothering system
C.When using the fixed CO₂ system
D.All of the above
单项选择题
When two fire hose teams are attacking a fire they should（）.
A.use different fire hose pressures
B.use fire hoses of different sizes
C.not attack the fire from opposite sides
D.not wear protective clothing
单项选择题
A shipboard Oil Pollution Emergency Plan is required of（）.
A.all vessels，regardless of size and commercial application
B.any barge or ship constructed or operated in such a manner that no oil in any form can be carried aboard
C.an oil tanker of 150 gross tons and above，or other ship of 400 gross tons and above
D.an oil tanker of 400 gross tons and above，or other ships of 150 gross tons and above
单项选择题
When fighting a fire in an enclosed space，the hose team should crouch as low as possible to（）.
A.protect themselves from smoke
B.obtain the best available air
C.allow the heat and steam to pass overhead
D.All of the above