Discovered something strange in a mini apartment fire: There were 4 fire extinguishers but only 1 was used, why?

Kim Lâm11:46:35 21/09/2023
According to a notice from Hanoi Police, among the 4 fire extinguishers sent for inspection, 3 were unused and 1 was used. So the reason why not use the remaining 3 fire extinguishers is also a question that many people wonder about.
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