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除了圆孔之外还有哪些情况需要标注中心线?? |
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发表于 2013-7-28 08:42:26
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发表于 2013-7-28 08:42:38
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发表于 2013-7-28 08:43:01
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发表于 2013-7-28 20:56:19
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