How do you operate a portable CO<sub>2</sub> fire extinguisher?().
A、Point the horn down
B、Turn cylinder upside-down
C、Break the rupture disc
D、Pull pin,squeeze grip
A、Point the horn down
B、Turn cylinder upside-down
C、Break the rupture disc
D、Pull pin,squeeze grip
A、Fine. How are you? B、How do you do? Glad to meet you, too. C、How are you? Thank you! D、Nice. How are you?