综述了3连通图中可缩边和可去边的性质以及它们在图中的分布情形。
This paper presents a survey on the properties and distributions of contractible edges and removable edges in 3 connected graphs.
注意事项：在配彩色透明槽时，要特别注意本漆对很浓很深的颜色，在尖锐的边角处可能会有明显的缩边现象，需要事先加以实验后再确定使用或不使用。
Notes to attention: when adjust colorful transparent groove, test is needed to determine use it or not use it as obvious shrinkage may encountered at spiculate margin caused by the fuscous .
本文介绍了铸钢件边冒口气缩扎的产生部位及特征，并对其形成机理及防止措施进行了探讨。
Synopsis: This paper introduces the position and characteristics of the blow hole shrinkage in the side riser of cast steel castings and probes into the formation mechanism and its prevention.
对于平板类、厚大凹型类铝合金铸件，采用边侧冒口的浇注系统，能提高铸件的补缩效果，生产出合格铸件。
Feeding effect can be improved with qualified casting using side riser gating system for plate or heavy concave aluminum alloy casting.
对于平板类、厚大凹型类铝合金铸件，采用边侧冒口的浇注系统，能提高铸件的补缩效果，生产出合格铸件。
Feeding effect can be improved with qualified casting using side riser gating system for plate or heavy concave aluminum alloy casting.
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