... 锐角弯头 sharp bend 锐缘孔 sharp-edged orifice 瑞士式锉刀 Swiss pattern file ...
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锐缘孔口 Orifice sharp edged ; sharp-edged orifice
锐缘圆孔口 [木] sharp-edged circular orifice
锐缘隔膜孔口 Orifice sharp edged diaphragm
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在内部作成圆形凸肩以代替锐缘孔板状的侧面。
It has rounded shoulders inside instead of the sharp orifice - like edge.
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It has rounded shoulders inside instead of the sharp orifice-like edge.
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