单选题0n a vessel ,a C02 extinguisher is checked by（）.Areading the gage pressureBweighing the extinguisherCdischarging a small amount of CO2Dseeing if the seal has been broken
单选题
0n a vessel ,a C02 extinguisher is checked by（）.
A
reading the gage pressure
B
weighing the extinguisher
C
discharging a small amount of CO2
D
seeing if the seal has been broken
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