The storing stability of urea formaldehyde resin adhesive with the change of PH value is researched in attempt to guide the production and imporove the application for products.
对脲醛树脂胶的贮存稳定性随p H值的变化进行研究，以指导生产，提高产品的适用。
Test the gastric acid secretion, PH, total gastric acidity value, total pepsin activity of change after irrigation.
测定给药后大鼠胃液分泌量、胃酸ph、胃液总酸度值、胃蛋白酶活性的变化。
According to the change of fatty acid content in the aging process of milled rice, and its relevance with PH value of milled rice, a new reagent to examine the freshness of milled rice was developed.
依据大米陈化过程中脂肪酸含量的变化及其与大米pH值之间的对应关系，研制出一种新的大米新鲜度快速检测试剂。
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