地表防水的措施有哪些？
参考答案：
①合理选择井筒位置；②河流改道；③铺设人工河床；④修筑排水沟；⑤堵漏。
My daughter is going through an important stage ______ she must learn to live independently(独立的) in her life.
A．where
B．which
C．what
D．when
挡水板通过水量超出设计要求，原因必定是挡水板加工和安装的质量未达到标准要求。( )
