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Bigger, better, bolder is the message being touted about the first of this year's London fashion weeks.
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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.，推荐阅读旺商聊官方下载获取更多信息
The 2984 was a huge step forward. Unlike the token-based machines of the 1960s,
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