All portable fire extinguishers must be capable of being（）.<br>A:carried by hand to a fire<br>B:carried or rolled to a fire<br>C:recharged in the field<br>D:used on class 'B' fires

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

出自：海船船员证

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