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vily
等级:Senior
文章:647
积分:4865
门派:zhangjiagang
注册:2007-3-12 10:55:13 |
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 钢管的实际尺寸
是生产过程中所得到的实际尺寸，该尺寸往往大于或小于公称尺寸。这种大于或小于公称尺寸的现象称为偏差。
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If you shed tears when you miss the sun, you also miss the stars. |
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