堤（坝）中轴线是控制堤（坝）身施工的基本（）。
参考答案：轴线
The family decided to the lazy servant.They really couldn't stand her. [ ]
A. pay back
B. pay off
C. pay for
D. pay up
旅客遗失客票的退款，按非自愿退票的规定办理。
