Mathematics is a subject with logicality.
数学是一门逻辑性极强的学科。
Index method was relatively simple and practicable, and model method had obvious logicality and system.
指数法计算方法较简单、实用；模型法具有较强的逻辑性和系统性；
Index method was relatively simple and practicable, and model method had obvious logicality and system.
指数法计算方法较简单、实用；模型法具有较强的逻辑性和系统性；
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