用含Pb、As、Sn地方生铁砂型铸造生产D型石墨铸铁的研究
용함Pb、As、Sn지방생철사형주조생산D형석묵주철적연구
An Investigation on Using Pb、As、Sn Containing Local Pig Iron and Sand Mould Casting to Produce D-Type Graphite Cast Iron
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