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在“基础台阶”界面中可以设置桥台下方的基础台阶，这样便可以更改桥台基础的形状。
在“添加台阶”对话框中可以添加基础台阶。已经添加的基础台阶也可以在图形窗口中通过动态标注或动态对象的方式来编辑。
“基础台阶”界面
