单选题To determine if a CO2 fire extinguisher is fully charged，you would（）.AOperate the trigger valveBWeigh the extinguisherCTest with a pressure gaugeDRead the date of last test
单选题
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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