單項(xiàng)選擇題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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2.單項(xiàng)選擇題Accumulations of oily rags should be().

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