单项选择题

某对称水闸宽度方向水平尺寸基准的位置是什么? What is the horizontal dimension benchmark at a width direction for a symmetric sluice?

A、水闸对称轴线the axis of symmetry of sluice
B、闸门槽处the sluice gate slot
C、水闸起始端The starting point of sluice
D、水闸尾端The end of sluice
微信扫码免费搜题