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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在邹露璐看来，代孕引发的一系列民事法律难题之外，当下更亟待解决的，还是代孕子女的落户这一基础民生问题。“相较于抚养权归属的争议，孩子的身份确认、户口登记，是保障其生存权、发展权的首要前提。”她说。