单项选择题
A.batten down the engine room
B.start the fire pump
C.apply carbon dioxide to the fire
D.shut off the fuel supply
单项选择题 A foam-type portable fire extinguisher would be most useful in combating a fire in（）.
单项选择题 A foam-type portable fire extinguisher is most useful in fighting a fire in（）.
单项选择题 A fixed CO2 system on a ship with a capacity of over 300 lbs (136 kilograms) CO2 which protects spaces other than tanks must have（）.