单选题In order to discharge a C02 portable fire extinguisher , the operator must first（）.Ainvert the CO extinguisherBsqueeze the two trigger handles togetherCremove the locking pinDopen the discharge valve
单选题
In order to discharge a C02 portable fire extinguisher , the operator must first（）.
A
invert the CO extinguisher
B
squeeze the two trigger handles together
C
remove the locking pin
D
open the discharge valve
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