Toextinguish(熄灭)differentkindsoffires,severaltypesoffir...
问题详情：Toextinguish(熄灭)differentkindsoffires,severaltypesoffireextinguishershavebeeninvented.Theymustbereadyforimmediateusewhenfirebreaksout.Mostportable(手提式的)kindsoperateforlessthanaminute,sot...