大连商品交易所发布市场风险提示函:近期国际形势复杂多变,大宗商品特别是纯苯、液化石油气、乙二醇、苯乙烯、聚丙烯、线型低密度聚乙烯等品种波动较大。请各会员单位关注市场动态,加强风险管理,引导市场参与者理性合规交易。
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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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