• Redd cloud nigrescence cloud, there is rain on.

    红云黑云必有大雨淋。

    youdao

  • This paper work out a better applied technique of steel normal-temperature quick nigrescence via discussing various factors' influence on the speed of nigrescence and the capability of plating.

    本文讨论诸多因素对黑化速度及黑化膜性能影响,确定较好的常温快速化学发黑实用技术

    youdao

  • This paper work out a better applied technique of steel normal-temperature quick nigrescence via discussing various factors' influence on the speed of nigrescence and the capability of plating.

    本文讨论诸多因素对黑化速度及黑化膜性能影响,确定较好的常温快速化学发黑实用技术

    youdao

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