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（）.
A.two or more releasing stations B.automatic release in event of a fire C.an audible alarm and time delay D.an audible and visible alarm
单项选择题 A fire starts on your vessel while refueling. You should FIRST（）.
单项选择题 A combination or all-purpose nozzle produces（）.
单项选择题 A CO2 portable extinguisher is annually checked by（）.
