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特朗普:美伊协议“非常乐观” 要求以方在黎“低调”
东方财富网期货频道为您提供了期货行情,期货知识,期货报价,期货操作技巧,期货资讯,期货评论等各方面的服务 ...
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连华科技COD快速测定仪5B-3C(V8)
1、 经典国标法:重铬酸钾回流消解,亚铁滴定法。方法原理:在强酸性介质下,用过量重铬酸钾氧化水中的还原性物质,过量的重铬酸钾用亚铁标液滴定,采用试亚铁灵指示终点的到达。再根据重铬酸钾的总量及亚铁量计算和重铬酸钾反应的还原性物质的耗氧量。
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