Toextinguish(熄滅)differentkindsoffires,severaltypesoffir...
問題詳情：Toextinguish(熄滅)differentkindsoffires,severaltypesoffireextinguishershavebeeninvented.Theymustbereadyforimmediateusewhenfirebreaksout.Mostportable(手提式的)kindsoperateforlessthanaminute,sot...