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标题:
啥材料?
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作者:
yetingjf
时间:
2003-11-20 20:09
标题:
啥材料?
我想问一下 CF 9SMnPb28 R=480-590N/mm2, UNI 4838-80是 啥材料?
还有 CF 17SMnPb10
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