There have been similar drops in tin, zinc, oil and other commodities.
锡 、 锌 、 棕榈油和其他商品的跌幅也与此类似.
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A decorative tin - zinc - nickel alloy electroplating process as an alternative to nickel plating was studied.
酸性锌 - 镍合金镀液中锌、镍的测定方法报道很多,而碱性镀液中锌、镍的测定报道很少.
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