Themathematical and mechanical model of the solution is simple and evident, can simplify thecalculation and control the error.
此解数学、力学模型简单、明确，使计算简化且能控制误差。
Themathematical and mechanical model of the solution is simple and evident, can simplify thecalculation and control the error.
此解数学、力学模型简单、明确，使计算简化且能控制误差。
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