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????3087??ˉ?????????????????????????????д??????20#??45#??16Mn??20mn??20cr??40cr??12Cr1MoV??10CrMo910?? 15CrMo??35CrMo??42CrMo?????????????????????????У???????????????????????ж?????????????????? ?? ????3087??ˉ???????????????????????????????400?????????豸??????????????С????????????????????10????108mm????1????20mm????3087??ˉ????????????????????豸????????????219????720mm????6????50mm????3087??ˉ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
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