A “fifteen-pound” CO2 extinguisher is so called because（）. A:there are fifteen pounds of CO2 in the container B:the container，when full，weighs fifteen pounds C:the pressure at the discharge nozzle is l5 psi D:the empty container weighs fifteen pounds

A “fifteen-pound” CO₂ extinguisher is so called because（）.
A:there are fifteen pounds of CO₂ in the container
B:the container，when full，weighs fifteen pounds
C:the pressure at the discharge nozzle is l5 psi
D:the empty container weighs fifteen pounds

出自：海船船员证

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