This paper focus on the classification teaching is carried out in the deaf school teaching accordance with sign language used as auxiliary means.

本文重点阐述了根据聋生的个体差异，如何实施分类教学，同时使用手语作为教学的辅助手段，使英语教学成为可能。

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This paper deals with the existence of two positive solutions for critical elliptic equations with a changed sign perturbation and with an auxiliary condition.

讨论了带变号扰动并且具有一定附加条件的临界椭圆方程的两个正解存在性。

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