The chemicals fired into the sky, usually dry ice or silver iodide, are supposed to provide a surface for water vapour to form liquid rain.

发射上天的化学物通常是干冰或碘化银，它们应该能为水蒸汽提供一个表面以凝结成雨滴。

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A method of forced filtration is given to solve the liquid-solid separation of dust from dust scrubber based on dust amount and characteristics of water dust scrubber of coal fired boiler.

根据燃煤锅炉水膜除尘器的灰水量及特性，提出了以强制过滤的方法，来解决水膜除尘器灰水液固分离的问题。

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In this paper, the method and some results of cold experimental investigations of liquid slagging coal-fired combustor are described.

本文叙述了液态排渣燃煤燃烧室冷态试验的研究方法和某些结果。

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Households with oil-fired central heating, and those using solid fuel or liquid petroleum gas to heat their homes, are much more likely to be in fuel poverty than "on-grid" households.

BBC: Winter Fuel Allowance Payments Bill