而细分作为一个优秀的几何造型工具，在弧长约束方面的研究也未多涉及。
However, subdivision as an excellent tool was not used in fields of geometric restriction.
详细分析了电源系统和高频引弧电路的结构组成和工作原理。
The principle and structure of power supply and HF arc ignition circuit is analyzed in detail.
介绍了窄间隙焊的特点，对坡口形式的确定、埋弧焊剂的筛选、焊接工艺参数的选择进行了详细分析。
Introduces the feature of the narrow gap welding, and analyses how to determine the form of groove, screen out submerged-arc welding flux and choose welding condition in detail.
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