Electroless plating technique has been widely used because of its unique advantages.
化学镀镍技术，以其独特的优越性正被广泛应用。
The invention relates to a piston ring and a surface spongy tin plating technique thereof.
一种活塞环及其表面松孔镀锡工艺。
The invention relates to a piston ring and a surface spongy chromium plating technique thereof.
一种活塞环及其表面松孔镀铬工艺。
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