以下为句子列表：
英文: A 2-D mathematical model is applied in the paper.
中文: 摘要河工模型采用变态模型，其相似性会受到影响。
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英文: A disaster recover system replica management scheme based on cluster servers is introduced in this paper, in which a consistency maintenance algorithm of multiple replicas and a replica selection algorithm are put forward and a mathematical model of quant
中文: 摘要提出一种基于集群服务器的容灾系统副本管理方案，提出多个副本的一致性维护和副本选择的算法以及副本数量和分布方式的数学模型。
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英文: A dynamic mathematical model of an air source heat pump water chiller/heater (ASHPWCH) under frosting was developed by connecting several of its component models according to principles of mass, momentum and energy conservation.
中文: 摘要在空气源热泵冷热水机组各部件模型的基础上，基于质量守恒定律、动量守恒定律和能量守恒定律，将这些部件模型有机地结合起来，建立了机组结霜工况下的动态数学模型。
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英文: A mathematical model for gear shaping was presented for machining of externally meshed non-circular gears with shaping procedure in terms of the positional relationship between the tool (cutter) and gear's pitch curve.
中文: 摘要根据范成法加工外啮合非圆齿轮时刀具和齿轮节曲线间的位置关系，提出了插齿加工的数学模型。
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英文: A mathematical model for the polycondensation process in PET production is developed.
中文: 介绍了一个工业化聚酯(PET)生产过程中的缩聚模型。
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