Rectification is a kind of unit-operation that needs high cost.
精馏是一种高投入的操作。
Simple elevator with electric hoist as power unit features low cost and ease of operation.
以电动葫芦为动力装置的简易升降机造价低廉，使用方便，但缺少明确的设计安装标准。
Simple elevator with electric hoist as power unit features low cost and ease of operation.
以电动葫芦为动力装置的简易升降机造价低廉，使用方便，但缺少明确的设计安装标准。
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