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.
这类并购之所以相对成功，在于潍柴背后有完整的发动机与动力系统产业链支撑，而不是单纯的财务投资冲动。
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Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04