单项选择题

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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单项选择题

A.consealed
B.detained
C.contained
D.kept

单项选择题

A.kept in nonmetal containers
B.discarded as soon as possible
C.cleaned thoroughly for reuse
D.kept in the paint locker

A fifteen-pound CO2 extinguisher（）.