This just show that we can get compounds which have anticipative structure through substitution reaction of precursor or by changing the reactive condition of the system.

这就说明，我们可以通过前驱体的取代反应和通过改变反应体系的条件来制备具有预期结构的化合物。

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This paper discusses the optimum condition for preparing carboxymethyl starch with high degree of substitution and high viscosity by using the solution isopropanol-water through etherification.

探讨了以异丙醇-水作溶剂，通过一次醚化，制备高取代度、高粘度羧甲基淀粉醚的最佳条件。

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A calculation model of the coefficient of heat transfer between gas and stave body and inlaid refractory is built based on the substitution method of boundary condition.

基于边界条件替换方法建立了高炉冷却壁本体和捣打料与炉气之间的换热系数计算模型。

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