单项选择题
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' fires
单项选择题 All of the following are part of the fire triangle EXCEPT（）.
单项选择题 After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.
单项选择题 After extinguishing a fire with CO2，it is advisable to（）.
