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  • 3. Acid activation acid activation solution should be able to remove corrosion products and oxide film (skin) on the surface of parts, without excessive corrosion on the matrix.

  • The two spines are 7 to 8 circles in the middle, while the ordinary spines are only 3 and a half circles, showing neat and beautiful. Now domestic customers see the positive and negative twisting rope, the impression is that the silk is too thin, can not play a protective role, in fact, it is not.

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