A fifteen-pound CO2 extinguisher（）. A:contains 15 pounds of CO2 B:weighs 15 pounds when full of CO2 C:has 15 pounds of pressure at the nozzle D:weighs 15 pounds when empty

A fifteen-pound CO₂ extinguisher（）.
A:contains 15 pounds of CO₂
B:weighs 15 pounds when full of CO₂
C:has 15 pounds of pressure at the nozzle
D:weighs 15 pounds when empty

出自：海船船员证

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