单选题How do you operate a portable CO2 fire extinguisher?（）APoint the horn downBTurn cylinder upside-downCBreak the rupture discDPull pin，squeeze grip
单选题
How do you operate a portable CO2 fire extinguisher?（）
A
Point the horn down
B
Turn cylinder upside-down
C
Break the rupture disc
D
Pull pin，squeeze grip
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