单选题All portable fire extinguishers must be capable of being（）.Acarried by hand to a fireBcarried or rolled to a fireCrecharged in the fieldDused on class 'B' fires
单选题
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
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