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[求助] 5#锌合金的硬度是多少?抗拉强度是多少?延伸率是多少? |
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树的方向由风决定,人生的方向由自己决定。
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RICKY TSUI
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手机版|小黑屋|中铸之家 ( 浙ICP备15041839号-1 )
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