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On the basis of the special of line centre surface,face centre surface and parabolic cylimder,the theory of analytique geometrie,the author gained convenient method that turn these three surface equations to standard.

根据线心曲面，面心曲面和抛物柱面的特殊性，依据已有《解析几何》理论，得出了化简这三种曲面方程为标准形的灵活简便的方

Objective To compare the relative accuracy of three methods measuring left ventricular volume by X-ray ventriculography:single plane area-length method, biplane area-length method, and single-plane Simpson s method.

目的　评价X射线心室造影计算左心室容积的 3种方法 :单平面面积 长度法、双平面面积 长度法和单平面Simpson法的相对准确性。

With the rapid development of the web technology and enhancement of college students information-obtaining ability,online psychological counseling will play a greater role.

随着网络技术的迅速发展、大学生信息素养的不断提高,在线心理咨询将发挥更大的作用。

Based on the thorough analysis of features,process,skills,and common problems of the psych-consultant hotline,some proposals are put forward.

我国的热线心理咨询发展至今已经将近二十年的时间,取得了很好的成效。