圖像來源，BBC CHINESE/ TING CHIANG
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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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（一）非正常损失的购进货物，以及与之相关的加工修理修配服务和交通运输服务；
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