Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）<br>A:Insure the chemical is powdery<br>B:Replace the cartridge<br>C:Pressure test the discharge hose<br>D:Test the pressure gauge for proper operation

Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）
A:Insure the chemical is powdery
B:Replace the cartridge
C:Pressure test the discharge hose
D:Test the pressure gauge for proper operation

出自：海船船员证

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