Traces of sulfate ions in etching solution for aluminum foil have been determined by turbidimetry in presence of cation surface activator-hexadecyl trimethyl ammonium bromide (CTMAB).
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3. 酸已经腐浊了金属的表面。
This acid has eaten into the surface of the metal.
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4. 酸已经腐浊了金属的表面。
This acid has eaten into the surface of the metal.