体育彩票超级大乐透201走势图

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    分享一下标准物质的分类

    发布时间: 2019-10-09  点击次数: 57次
       分享一下标准物质的分类

      标准物质体育彩票超级大乐透201走势图可以是纯的或混合的气体、液体或固体。例如,校准粘度计用的水、量热法中作为热容量校准物的蓝宝石、化学分析校准用的溶液。标准物质和化学试剂没有必然的联系。标准物质可以是高纯的 化学试剂(但高纯试剂不一定就是标准物质,还要看是否符合标准物质的特征以及是否有相应的标准证书),也可以是按照一定的比例配制的混合物(例如pH标准溶液),甚至可以是一些天然样品按照一定的方法制备的具有复杂成分的标准样品(比如临床分析中的标准物质、工业上不同品质的样品)。

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