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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A.consealed
B.detained
C.contained
D.kept
A.kept in nonmetal containers
B.discarded as soon as possible
C.cleaned thoroughly for reuse
D.kept in the paint locker
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Flame screens are used to（）.
Halon extinguishes a fire by（）.
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Foam extinguishes a fire by（）.
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Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.