when the remaining charge volume is less than 90 percent of the required VOLUME
at each inspection for certification
at each annual inspection
when the weight loss exceeds 10% of weight of charge
第1题：
A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged.It should be ______.
A.replaced in its proper location if weight loss is no more than 15%
B.replaced in its proper location if weight loss is no more than 25%
C.labeled empty and recharged as soon as possible
D.labeled empty and replaced in its proper location regardless of weight
第2题：
The most effective way of applying carbon dioxide from a portable extinguisher to a fire is by ______．
A.Forming a cloud cover over the flames
B.Directing the gas at the base of the flames in a slow sweeping motion
C.Discharging the carbon dioxide into the heart of the flames
D.Bouncing the discharge off an adjacent bulkhead just above the burning surface
第3题：
Portable carbon dioxide fire extinguishers should be sent ashore to be recharged
A.when the remaining charge volume is less than 90 percent of the required volume
B.at each inspection for certification
C.at each annual inspection
D.when the weight loss exceeds 10% of weight of charge
第4题：
Carry （）（手提灭火器）to the fire place.
第5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
第6题：
To determine the number of portable fire extinguishers required on an inspected vessel，you should check the ______.
A.hot work permit
B.Certificate of Inspection
C.Safety of Life at Sea Certificate
D.station bill
第7题：
______, as the chemical extinguisher agent, should be used for an electric fire.
A.dry chemical or foam
B.foam or soda acid
C.carbon dioxide or foam
D.carbon dioxide or dry chemical
第8题：
In the event of fire in a machinery space，______.
A.the fixed carbon dioxide system should be used only when all other means of extinguishment have failed
B.the fixed carbon dioxide system should be used immediately，as it is the most efficient means of extinguishment
C.water in any form should not be used as it will spread the fire
D.the space should be opened 5 minutes after flooding CO2 to prevent injury to personnel
第9题：
All portable fire extinguishers must be capable of being ______.
A.carried by hand to a fire
B.carried or rolled to a fire
C.recharged in the field
D.used on class “B” fire
第10题：
Batten down the engine room
start the fire pump
apply carbon dioxide to the fire
shut off the fuel supply