To determine if a CO2 fire extinguisher is fully charged，you would（）. A:Operate the trigger valve B:Weigh the extinguisher C:Test with a pressure gauge D:Read the date of last test

To determine if a CO₂ fire extinguisher is fully charged，you would（）.
A:Operate the trigger valve
B:Weigh the extinguisher
C:Test with a pressure gauge
D:Read the date of last test

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