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[求助] 请教DN15,20,......的规格(外径*内径*厚度)是多少? |
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发表于 2009-8-19 19:41:19
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发表于 2011-1-14 21:47:49
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发表于 2011-1-15 20:20:29
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发表于 2011-2-16 21:35:34
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