How do you operate a portable C02 fire extinguisher?（）. A:Point the horn down B:Turn cylinder upside-down C:Break the rupture disc D:Pull pin, squeeze grip

How do you operate a portable C0₂ fire extinguisher?（）.
A:Point the horn down
B:Turn cylinder upside-down
C:Break the rupture disc
D:Pull pin, squeeze grip

出自：海船船员证

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