Previously, the dirtiest way we could distinguish stainless steel screws from iron ones was with a magnet. If you suck on this screw, if it sucks up, you know i...
1, the benchmark first: that is, the first processing datum, parts in the process of mechanical processing, as the positioning of the appearance of the benchmar...
The main characteristics that reflect the quality of direct plating are the conductivity of hole wall and the deposition rate of copper plating layer....
Zinc dissolves easily in acids and also in alkalis, so it is called an amphoteric metal. Zinc changes little in dry air. In moist air, the zinc surfac...
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