提出了弱区组设计的概念，并根据仿射几何和射影几何构造了仿射流形码和射影流形码。
The concept of weak block design is proposed in this paper. Based on affine geometry and projective geometry, affine manifold codes and projective manifold codes are constructed.
其中，平板型电除尘器收尘极板表面存在场强和电流弱区，且处理高比电阻的尘粒时容易发生反电晕；
There exist weak zones of electric field and current density on the collecting plate when flat plate is used, and back corona tends to occur when the resistivity of particles is high.
目前，直放站已成为提高运营商网络质量、解决网络盲区或弱区问题、增强网络覆盖的主要手段之一。
At present, in order to improve the network's quality, solve the network's blind spots or weak areas and enhance the network's coverage, the repeater has already been one of the principal means.
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