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）提供域名注册服务的，应当采取监测发现、阻断、处置恶意注册、仿冒域名的措施，以及对用于实施违法犯罪活动域名的处置措施；
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在中國，由於審查法律，創作男男題材的女性曾遭逮捕，使這個類型被迫轉移到更地下的平台和隱藏討論串中。