采用一阶导数 the first order derivative spectrophotometry ; the first derivative 一阶右导数 stage progressive derivative .
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METHODS: The first order derivative spectrophotometry was used.
方法：采用一阶导数分光光度法。
The Content of phenytoin sodium (for injection) was determined directly by the first order derivative spectrophotometry.
本文采用一阶导数紫外分光光度法直接测定注射用苯妥英钠的含量。
METHODS: to test the contents of cefotaxime sodium and cimetidine in all kinds of infusions using first order derivative and double wavelength spectrophotometry.
方法：采用一阶导数分光光度法和双波长光谱法测定各配伍液中头孢噻肟钠和西咪替丁的含量。
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