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本文采用趋势分析、成本收益分析和比较分析法,分析了2001-2015年甘肃省棉花生产成本收益的时序变化趋势与特征,揭示了成本与收益......
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Existence and Multiple of Positive Solution for Nonlinear Fractional Difference Equations with Param
Let,. We study the existence and multiple positive solutions of n-th nonlinear discrete fractional boundary value proble......