63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
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The story of the discovery will be featured on BBC Two's Digging for Britain on 14 January at 21:00 GMT, or on BBC iPlayer.
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At least 15 killed after military plane carrying banknotes crashes in Bolivia。关于这个话题，WPS下载最新地址提供了深入分析