How to access (multi) index of a Data Frame?
如何访问(多)一个数据帧索引？
This is an office building. It is a multi–layer reinforced concrete frame.
本工程为丹东职业中专办公楼，为多层现浇钢筋混凝土框架结构。
Jacket platform was assumed as steel frame structure and multi-objective design method was performed.
把导管架海洋平台看作钢框架结构，并把多目标优化设计方法用于其结构的抗震设计中。
Jacket platform was assumed as steel frame structure and multi-objective design method was performed.
把导管架海洋平台看作钢框架结构，并把多目标优化设计方法用于其结构的抗震设计中。
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