单项选择题
An ABC dry chemical fire extinguisher would be LEAST effective against a fire in（）.
A.a mattress B.spilled liquids such as oil or paint C.high voltage electrical gear D.a trash can
单项选择题 All portable fire extinguishers must be capable of being（）.
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（）.
