This paper reported the extraction and the preliminary determination of flavonoids in sweet potato leaves and stems by UV-spectrophotometry using rutin as comparison sample.

通过对甘薯叶、茎中的总黄酮含量进行了提取，以芦丁为对照品，用紫外分光光度计对其含量进行了初步测定。

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The advantage of this method is that preliminary determination of the position of the major polarization axis is not needed and calculations of beat lengths become very simple.

本方法的优点是不须预先确定光纤的偏振主轴的位置而且拍长度的计算也很容易。

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The amount of the provisional anti-dumping duty, cash deposit, bond or other forms of security provided shall not exceed the margin of dumping established in the preliminary determination.

临时反倾销税税额或者提供的保证金、保函或者其他形式担保的金额，应当不超过初裁决定确定的倾销幅度。

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Last month (January 2013), the Commerce Department issued its preliminary determination in the 7th annual administrative review in the Furniture case, which includes a discussion about the Chinese companies reviewed in the proceeding.

FORBES: Tomatoes, Furniture, and Shrimp: Is Extortion the Main Purpose of the Antidumping Law?