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Las normas del Ministerio de Industria Química rara vez se actualizan. hg20570 es un estándar de 1995.

2016-07-20View Original

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¿Ha encontrado algún estándar que pueda reemplazar a 20570?
Reply #22016-10-27
También pregunto por qué las normas no se han actualizado después de más de 20 años.

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