Wave mathematical model of parabolic gentle slope equation is an effective method for calculating waves of wide scope.

抛物线形缓坡方程波浪数学模型是进行大范围波浪计算的有效方法。

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Arable land gradation and classification is one of important parts of present land resources investigation of wide scope and fundamental tasks of the land management department.

农用土地分等定级是当前国土资源大调查重要组成部分，是土地管理部门一项重要的基础工作。

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Arable land gradation and classification is one of important parts of present land resources investigation of wide scope and fundamental tasks of the land management department.

农用土地分等定级是当前国土资源大调查重要组成部分，是土地管理部门一项重要的基础工作。

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