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Оказавшиеся в Дубае российские звезды рассказали об обстановке в городе14:52
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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.
Number (0): Everything in this space must add up to 0. The answer is 0-2, placed horizontally.
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