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。
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