Objective: To analyze the aberration properties of contact lens and its central back vertex power measurement.
目的：探讨接触镜的球差特征以及后顶焦距测量的实质。
Objective:To confirm that the lensometer adjusted by the special lenses group for contact lenses can't express the back vertex power of contact lenses.
目的：证实采用接触镜专用标准透镜组标定的焦度计不能准确测定被测角膜接触镜的顶焦度。
This paper describes the error in focimeters, the principle of selection on curvature of inside face for vertex power of standard lenses and the method for measuring them.
本文叙述了焦度计的误差，顶焦度标准镜片内表面弯度的选择原则，以及标准镜片的测量方法等。
A common property of many large networks is that the vertex degrees follow a scale-free power-law distribution, the BA model features two generic mechanisms: the networks expanding and the pref.
实际网络中节点分布的一个广泛特征是度的无标度幂率分布，BA模型认为形成这种特征的两个主要因素是网络增长和节点间的偏好连接。
It is found that different types of real-world networks the vertex vanishment follows a strong degree preference, the vanishment rate of degrees also follows a scale-free power-law distribution.
通过对不同类型的实际网络中节点消退情况的统计分析发现，实际网络中节点的消退有很强的度偏好，不同度的节点的消退率同样具有幂率分布特征。
It is found that different types of real-world networks the vertex vanishment follows a strong degree preference, the vanishment rate of degrees also follows a scale-free power-law distribution.
通过对不同类型的实际网络中节点消退情况的统计分析发现，实际网络中节点的消退有很强的度偏好，不同度的节点的消退率同样具有幂率分布特征。
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