Chemists and engineers worry about the effect of any process modification on a critical component or on the stability of an irreplaceable antique.
化学家和工程师担心这任何过程修改对关键部分的影响或者在稳定上一不能替代古老。
A new process of obtaining black antique-silver appearance on brass substrates was presented.
提出一种在黄铜件表面获得黑色古银外观的新方法，介绍了其工艺流程和各工序配方。
A new process of obtaining black antique-silver appearance on brass substrates was presented.
提出一种在黄铜件表面获得黑色古银外观的新方法，介绍了其工艺流程和各工序配方。
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