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| blacking of stainless steel (【技】将不锈钢放置在390 ~ 400°C 的重铬酸钠溶液中保持约 15min 以生成黑色膜层的表面处理方法。经处理后获得的黑色膜层能有效吸收太阳能，在利用太阳能采暖方面应用前景广泛。) | |||
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