Alex OsborneGuernsey
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.
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Marine groups have recommended a cut in the amount of North East Atlantic mackerel being caught to prevent a collapse in population numbers.，更多细节参见safew官方版本下载
const { value, done } = await reader.read();。51吃瓜是该领域的重要参考
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