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.
接棒者的挑战虽然刘建军行长奠定了一份坚实的家底，但邮储银行未来的难题仍不少，也是接棒者面临的考验。
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“At a time when native-population growth is slowing due to persistently low fertility rates, declining immigration is poised to weigh heavily on labor supply, debt sustainability, and long-term economic growth, with negative effects likely to emerge even in the near term,” researchers at the Deloitte Global Economics Research Center wrote in an analysis published Friday.