[单选] Which is the proper method of determining whether a portable CO₂ fire extinguisher needs recharging?（）

A . Check the tag to see when the extinguisher was last charged
B . Release a small amount of CO₂; if the CO₂ discharges，the extinguisher is acceptable
C . Weigh the extinguisher and compare the weight against that stamped on the valve
D . Recharge the extinguisher at least once each year

非正式群体的性质类型主要有（）、（）、（）等。确定公务员级别的依据是什么？赵安中先生于哪一年拉开他在故乡捐资助学的序幕？（） 1984。 1985。 1986。 1987。本地用户abc既属于power users组，又属于Backup Operators组，则该用户拥有（）。 A.管理员权限。 B.文件权限。 C.普通用户权限。 D.新建普通用户、任意备份文件权限。定期考核的结果应当以书面形式通知公务员本人。（） Which is the proper method of determining whether a portable CO₂ fire extinguisher needs recharging?（）

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[单选] Which is the proper method of determining whether a portable CO₂ fire extinguisher needs recharging?（）