在美国,烟雾报警器多久测一次?
美国消防局写明,每个月测试一次烟雾报警器。9伏电池、密封的10年电池、和接入房屋线路的报警器都一样。9伏电池,以及有线报警器的备用电池,至少每年换一次。
Household
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