以下为句子列表：
英文: After application of this demulsifier, the dehydration rate has been improved arid operation cost has been saved.
中文: 应用该破乳剂后，明显提高破乳剂的脱水率，节约了运行成本。
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英文: After the analysis of the operation cost characteristics and composing in high speed railway, the methods and means of activity-based costing of operation cost account were put forward.
中文: 本文通过对高速铁路条件下运营成本的特点、构成状况的分析，采用作业成本法核算高速铁路的运营成本的原理、方法。
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英文: As a example of a residential district, analysis of the economical efficiency of different modes of district cooling systems is carried on in initial investment and operation cost in order to supply reference to the correct choosing of cold source of dist
中文: 以某住宅小区为例，对居住区实行区域供冷不同系统的经济性从初投资和运行费用两个方面进行了分析，为正确的进行区域供冷的冷源选择提供参考。
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英文: Based on the analyses of the investment of nozzle tube net and relationship between the annual operation cost and tube diameter function of a fixed spray irrigation system, a mathematic model to calculate the economical tube diameter of a spray irrigation
中文: 摘要在分析了固定式喷灌系统的管网投资、年运行费用与管径函数关系的基础上，利用工程经济分析中费用最小化准则和非线性规划理论，建立了求解喷灌系统管网经济管径的数学模型，并给出了无约束条件直接求解经济管径的计算式。
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英文: Breif introduction of several typical clean-room systems used in different cleanliness, analyze the differences between construction and operation cost of various systematic model, Give methods of choosing advanced solution of clean room.
中文: 简述了不同级别洁净室采用的几种典型的洁净室系统型式，分析了不同的系统型式的建造及运行成本的差异比较，提出了关于洁净室的优先方案选择的方法。
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