is effective if used promptly on an oil fire
has a greater cooling effect than water
is lighter than air
is harmless to cargo and crew
第1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2题：
You will extinguish a fire when you remove （）.
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：
utilizing carbon dioxide or dry chemical fire extinguishers
utilizing soda and acid fire extinguishers
blowing the flames out
letting it burn itself out
第5题：
第6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7题：
Batten down the engine room
start the fire pump
apply carbon dioxide to the fire
shut off the fuel supply
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：
at the base of the flames
at the center of the flames
to the lee side of the flames
over the tops of the flames
第10题：
Class A and class B
Class B and class C
Class A and class C
Class C, class D, and class E