以下为句子列表：
英文: Abstract: By the first integral method and properties of integral depending on a parameter, the necessary and sufficient condition on the existence of dead core solution for the boundary value of a class of nonlinear ordinary differential equations has be
中文: 文摘:应用首次积分法并结合含参变量积分的性质，具体构造了一类二阶非线性常微分方程边值问题存在非负死角解的充分必要条件.
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