单选题A fifteen-pound CO2 extinguisher（）.Acontains 15 pounds of CO2Bweighs 15 pounds when full of CO2Chas 15 pounds of pressure at the nozzleDweighs 15 pounds when empty
单选题
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
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