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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小微商户是市场经济的“毛细血管”。丽水人在全国开办的超市有6万多家，可分散在各地的“丽水商超”普遍面临一些融资问题：经营商品流动性强、经营场地多为租赁，缺乏有效抵押物；再加上融资需求信息不对称，导致银行想贷难放贷。