... sphalerite闪锌矿 sphen榍石 sphere球 ...
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sphen oidal electrode 蝶骨电极
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It is difficult to contended quality require on common machine tool for more group high accurate concave sphen-cal surface.
对多组较高精度要求的凹球面,在普通机床上加工质量难满足图纸要求的问题。
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