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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第一百零一条 询问聋哑的违反治安管理行为人、被侵害人或者其他证人，应当有通晓手语等交流方式的人提供帮助，并在笔录上注明。