在美国，烟雾报警器该装在哪里？
美国消防局写明，每个卧室和睡眠区里面放一个烟雾报警器，每个外面也放一个，房子每一层都要有，包括地下室。装在天花板上，或墙的高处。有线报警器只由合格电工安装。
Household
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