This paper presents a new type material for making air valve cage-alloy cast iron countaining Cr. Ni.

本文介绍一种制做内燃饥气阀座的新材质——铬镍铜合金铸铁。

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This paper presents a new type material for making air valve cage-alloy cast iron countaining Cr. Ni.

本文介绍一种制做内燃饥气阀座的新材质——铬镍铜合金铸铁。

youdao