单选题You can determine that a C02 fire extinguisher is fully charged by（）.Alooking at the gageBchecking the nameplate dataCweighing by handDweighing on a properly calibrated scale
单选题
You can determine that a C02 fire extinguisher is fully charged by（）.
A
looking at the gage
B
checking the nameplate data
C
weighing by hand
D
weighing on a properly calibrated scale
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解析：
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