以下为句子列表：
英文: (Is the entry a bag rather than a set, in mathematical terms?
中文: （对精确的术语来说，入口是一个包而不是一个集合？）
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英文: 14 quality indexes of the dry white noodle made of 29 wheat breeds extended in North China were determined wholly, the mathematical evaluation model was set up based on 5 main component indexes selected by Principal Component Analysis (PCA) for evaluating
中文: 摘要对29个中国北方的推广小麦品种制作的干白面条14个品质指标进行了全面测定，采用主成分分析法提取5个主成分指标构建数学评价模型，综合评价面条的各种品质，优选出了泰山23、洛展1号、豫农949、太空6号等优质的面条专用小麦品种。
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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 child who is allowed to explore with real mathematical objects at an early, motor-sensorial age stands a good chance of becoming a real math lover later in life.
中文: 孩子在他的早期以感性认识为主的阶段可以接触到真实的数学物体，能够使他有更大的机会成为一个真正的数学爱好者。
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英文: A comparison study on three kinds of mathematical model, namely, single-objective linear programming model, multi-objective linear programming model and single-objective nonlinear programming model is made based on the related theoretical analysis and the
中文: 摘要以寻找工程实践中最可行的管网优化模型为目的，通过理论分析和实例计算对工程中常用的单目标线性规划模型、多目标线性规划模型和单目标非线性规划模型进行对比研究。
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