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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.
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（二）移动、损毁国家边境的界碑、界桩以及其他边境标志、边境设施或者领土、领海基点标志设施的；，更多细节参见谷歌浏览器【最新下载地址】
在上海居住多年的德商麥永剛（（Juergen Meyer）向BBC中文指出，即便德國盼望平衡雙邊貿易需求，但德企去風險化的工作遠遠不足，抵禦中國進口衝擊，不僅是汽車產業，德國的生物科技及化工產業情況都很險峻。