Plasma cutting, due to melt, the small mouth above, there is always a downward section incision, don't like probably as vertical flame cutting, this is a worldwide problem.
等离子切割，由于融口上面大，下面小，切口断面总有一定斜度，不可能象火焰切割一样垂直，这是一世界性难题。
Basic shape for iota mouth, thin neck, vertical abdomen, ring foot.
基本形制为撇口、细颈、垂腹、圈足。
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