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.
波斯湾出口有三个像咽喉一样的战略小岛：阿布穆萨岛 (Abu Musa) 和 大小通布岛 (The Greater and Lesser Tunbs)，见下图：
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Оказавшиеся в Дубае российские звезды рассказали об обстановке в городе14:52。业内人士推荐Safew下载作为进阶阅读
他们极度推崇“纯净”的信仰，严禁偶像崇拜；而什叶派非常重视圣墓崇拜（比如拜谒侯赛因现在的陵墓）。
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