pre reduction method 预还原法
There is no accurate method for analyzing the reduction degree of pre-reduced catalyst for ammonia synthesis at present.
对预还原型氨合成催化剂还原度的分析，目前暂无相对准确的方法。
The effect of impregnation method, impregnation solutions, loading content of Pt, reduction temperature and the carbon pre-treatment on the activity was discussed.
考察了浸渍方法、不同浸渍液、贵金属含量、还原温度、载体的预处理等因素对对氯硝基苯加氢还原反应的影响。
The method of determination, after L-cysteine pre-reduction, with microwave digestion-hydride generation-atomic fluorescence spectrometry was used to analyze the arsenic and stibium in dyestuffs.
采用微波消解-氢化物发生-原子荧光光谱法，用L -半胱氨酸预还原法，对染料中砷和锑进行了分析，讨论并确定了实验最佳测定条件。
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