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
正确答案：D
你如何操作CO2灭火器？拉出锁销挤压把手
HowdoyouoperateaportableCO2fireextinguisher?______A
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