对化学镀镍加工的凝汽器黄铜管进行了性能检测，镀镍管镀层各项性能指标均达到了相关的技术标准。
The plating performance of electroless nickel-plated condenser brass tubes was tested and all the performance indicators were in accordance with the related technology standards.
而且当单钩和别子在开锁时和相对柔软的黄铜或镀镍层接触的时候，就会留下凿痕和磨擦的痕迹。
When contacting the softer brass or nickel-silver of locking components, pick and tension tools leave marks in the form of gouges and scratches.
这颗球的材质是镀镍的黄铜。
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