航海英语海上消防单项选择题每日一练(2019.01.03)

单项选择题
How is the external flotation bladder of an immersion suit inflated?（）
A.It is inflated by a small CO₂ bottle that is automatically tripped when the front zipper is at the top of the zipper track
B.It is inflated by a small CO₂ bottle that is manually tripped
C.It is inflated by blowing through an inflation tube
D.It inflates by sea water bleeding into the flotation bladder and reacting with a chemical therein
单项选择题
A carbon dioxide fire extinguisher should be recharged（）.
A.at least annually
B.whenever it is below its required weight
C.only if the extinguisher has been used
D.before every safety inspection
单项选择题
According to the regulations，what fire safety control feature is required in quick-closing shut off valves?（）
A.Electrical cut off switch
B.A fusible link
C.Manual cut off switch
D.A water spray actuator
单项选择题
Foam extinguishes a fire by（）.
A.shutting off the air supply
B.cooling the fuel to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition
单项选择题
Controls for a fixed carbon dioxide system shall be mounted（）.
A.directly outside the space protected by the system
B.as near the gas cylinders as possible
C.in the pilothouse
D.on the main deck near the bow