How to access (multi) index of a Data Frame?

如何访问(多)一个数据帧索引？

youdao

So, the whole frame of fuzzy seismic damage index prediction method is built.

从而构建了模糊震害指数法的整体理论框架。

youdao

So, the whole frame of fuzzy seismic damage index prediction method is built.

从而构建了模糊震害指数法的整体理论框架。

youdao