Kevin Church/BBC News
The strike in England is due to last from 0700 GMT on Wednesday, 17 December until 0700 on Monday, 22 December.
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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.，这一点在heLLoword翻译官方下载中也有详细论述
На Западе подчинили рой насекомых для разведки в интересах НАТО08:43。关于这个话题，safew官方版本下载提供了深入分析