In many flutter analysis methods, the PK-F method is an equivalent flutter analysis method in common use.
在众多桥梁颤振分析的实验加理论方法中，PK - F法是一种通用性很强的等效颤振分析方法。
The third chapter reviews the urban farmers' social insurance models that used in PK, SH, etc. , then analyzes the insufficiency of these models and enlighten how to make good use of them.
第三章从实证角度评述了京沪等地现行农民工社会保障模式，并分析了现行模式的不足及其对我们的启示。
The third chapter reviews the urban farmers' social insurance models that used in PK, SH, etc. , then analyzes the insufficiency of these models and enlighten how to make good use of them.
第三章从实证角度评述了京沪等地现行农民工社会保障模式，并分析了现行模式的不足及其对我们的启示。
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