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.
克林頓發言人表示，這些行程包括「為克林頓基金會工作而安排的停靠」。
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Paramount initially proposed to pay $30 per share, in an all-cash offer, which it said gave shareholders more certainty than Netflix's plan. However, it then increased its offer to $31 per share.，更多细节参见爱思助手下载最新版本
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