A.pressure release
B.backfire flame arrestor
C.automatic shut off
D.flow valve
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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
A.a continuous ringing for 10 seconds
B.one short ring followed by one long ring
C.two long rings of at least 20 seconds
D.a continuous ringing until the fire is extinguished
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Controls for a fixed carbon dioxide system shall be mounted（）.
Each hand portable fire extinguisher must be marked with（）.
A fire main system must have enough fire hydrants so that each accessible space may be sprayed with（）.
Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.
Control of flooding should be addressed（）.
During the required periodic abandon ship drill aboard a ship，each person not assigned duties in the muster list is（）.
Blocking open or removing fire dampers can cause（）.
Automatic fire dampers in ventilation systems are operated by a（）.
Each fireman’s outfit and its spare equipment on a vessel must be stowed（）.
Before using a fixed CO2 system to fight an engine room fire，you must（）.