编辑同志:我们对各类手提式灭火器的失效问题颇伤脑筋。这类灭火器新配备时没用上,等派上用场时又往往因平时没注意换药或充气而失效了。到底泡沫、干粉、“1211”、二氧化碳、酸碱等五种灭火器的有效期是多长呢?用何种方法去衡量它是有效的呢?用什么简便方法即可知道需要换药或 Editorial comrades: We are quite troubling about the failure of various types of portable fire extinguishers. Such fire extinguishers new equipment is useless, and so come in handy often do not pay attention because of the usual dressing or inflatable failure. In the end foam, dry powder, “1211 ”, carbon dioxide, acid and alkali and other five kinds of fire extinguishers is valid for how long it? What method to measure it is effective? In what easy way to know the need for dressing or