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

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

出自：海船船员证

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