本文论述了糠醛碱性缩合反应的基本原理和利用该反应合成呋喃类香料的具体应用，并对一些呋喃类香料的香气特征作了介绍。
In this article, the basic principle of alkaline condensation reactions of furfural as well as their application in the synthesis of furan perfume are described.
初步的研究表明：西湖沉积物中的碱性磷酸酶活性和底泥中溶解性磷的变化趋势基本一致，但高浓度的溶解性磷对APA产生一定的抑制作用；
The primary experiment shows that: The trend of APA in the sediment was coincident with the dissolved phosphorus(DP), but high concentration of DP will restrain APA to a certain extent.
采用碱性平炉+ESR(电渣重熔)法生产高强韧管坯，能完全满足管坯的各项技术要求，各项理化检测结果与采用碱性平炉+真空除气+ ESR法生产的同类管坯水平基本相当。
The tube bloom made by this method has given out the same physical and chemical test results as that made by basic open-hearth furnace + vacuum degassing process + ESR process.
理化性质不同的土壤吸附氟的能力各不相同，基本规律是酸性土壤吸附氟的能力较强，而碱性土壤较弱。
Of six soils tested, the adsorption of fluoride on acidic soils was stronger then that on alkaline soils.
理化性质不同的土壤吸附氟的能力各不相同，基本规律是酸性土壤吸附氟的能力较强，而碱性土壤较弱。
Of six soils tested, the adsorption of fluoride on acidic soils was stronger then that on alkaline soils.
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