I-4 new surface treatment process is studied by chemical conversion coating technology.
采用化学转化膜技术，研制出I - 4表面处理新工艺。
This technology is using the principle of catalysts in chemical process.
本技术采用化学处理过程中催化剂的作用。
This technology is using the principle of catalysts in chemical process.
本技术采用化学处理过程中催化剂的作用。
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