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db_storage = DatabaseStorage(self.config.db_path)，这一点在91视频中也有详细论述
There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.，更多细节参见搜狗输入法下载
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