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单选题
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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单选题Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）A
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Replace the cartridgeC
Pressure test the discharge hoseD
Test the pressure gauge for proper operation
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