水下氧弧切割技术是一种方法简单，应用广泛的技术。
Under-water oxygen-arc cutting technology is easy for operation and widely used.
本文介绍了一种适用于生产的、结构简单的等离子弧焊枪。
This paper presents you a simple structure plasma welding gun which is suitable for production.
它所定义的网络只具有简单节点及不重名弧（部件）。
The network is defined as a graph which only contains simple nodes and arcs(no duplicative arcs).
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