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bob体肓_Bob体育综合APP登录入口下载
bob体肓
浅谈铝合金的加工工艺
2023-11-06

纯铝的密度小,大约是铁的 1/3,熔点低,铝是面心立方结构,故具备极高的塑性,易于加工,可制作成...

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