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"content": self.content
，详情可参考旺商聊官方下载
free_list[classno] = h;，更多细节参见heLLoword翻译官方下载
could not be used with 3600 controllers. Since 3600 systems were widely
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.