采用陶瓷外喷嘴可以将喷嘴高度设为零，即喷口端面直接接触被切割表面，可以获得很好的效果。
Adopt ceramic nozzle can be the nozzle, that is set to zero height vent end direct contact with the surface is cut, can achieve very good result.
喷嘴高度：指喷嘴端面与切割表面的距离，它构成了整个弧长的一部分。
Five, the nozzle height: refers to the nozzle surface and cutting the distance from the end, it constitutes the part of the whole arc long.
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