单项选择题
Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）
A.Test the pressure gauge for correct reading
B.Weigh the cartridge
C.Replace the dry chemical
D.Pressure test the discharge hose
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Where would you find the “call sign” or “call letters”of the radio station on your rig?（）
A.In the rig safety manual
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