This paper reports the development and the application detail of cobalt-free, lead-free and environmentally friendly exhaust valve seat insert.
这篇论文详细报道了无钴、无铅及有利于环境的排气阀座圈的开发与使用。
This paper reports the development and the application detail of cobalt-free, lead-free and environmentally friendly exhaust valve seat insert.
这篇论文详细报道了无钴、无铅及有利于环境的排气阀座圈的开发与使用。
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