... multiple currency security 多种货币偿还债券 multiple effect evaporation 多效蒸发 multiple effect evaporator 多效蒸发器 ...
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multiple-effect evaporation 多效蒸发
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In respect of the producing method, refined and high unmixed salt is usually made by multiple effect evaporation in vacuum, when man-made bittern is needed.
从制取方法上来讲，多效真空蒸发制盐是生产精制盐及高纯工业盐的重要方法。
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