Gas accident alarm circuit
Source: InternetPublisher:清宁时光 Updated: 2012/05/24
![煤气事故报警电路](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/b1f10ee6-3c63-11ec-b1c7-086126841eb8.gif)
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