The test is invalid if the monitor solution is not comparable with the reference solution.

如果控制溶液和对照溶液没有同时比较进行，试验无效。

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A brown spot in the chromatogram obtained with the test solution corresponds in position and color to the spot in the chromatogram obtained with the reference solution.

供试品色谱中，在与对照品色谱相应的位置上，显相同的棕色斑点。

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Aspirate the reference solution after every third calibration or test solution to check stability of base line. Calculate standard deviation for every third solution aspirated.

在对被测试溶液进行三次校准后，就要抽取标准溶液进行校验其基线的稳定性，并计算每三次抽取的溶液的标准偏差。

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Undefined reference, what was the solution last time?

未定义的引用，上次我们是怎么解决的呢？

哈佛公开课 - 计算机科学课程节选

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