first to the bottom of the flaming area，sweeping from side to side，and following the flames upward
in a circular motion from the middle of the bulkhead outward
to the top of the flaming area，sweeping from side to side，and working toward the bottom
in an up-and-down motion from one side of the bulkhead to the other
第1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2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：
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5题：
Batten down the engine room
start the fire pump
apply carbon dioxide to the fire
shut off the fuel supply
第6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7题：
You will extinguish a fire when you remove （）.
第8题：
One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is
A.the 'snow' which is sometimes discharged along with the gas is toxic
B.prolonged exposure to high concentrations of CO2 gas causes suffocation
C.rapid dissipation of the CO2 vapor
D.the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck
第9题：
第10题：
the snow which is sometimes discharged along with the gas is toxic
prolonged exposure to high concentrations of C02 gas causes suffocation
rapid dissipation of the C02 vapor
the C02 gas is lighter than air and a large amount is required to extinguisha fire near the deck