单项选择题
A.2~3B.2.5~3.5C.3~4D.3.5~4.5
A.2.0~2.5B.2.5~3.0C.3.0~3.5D.3.5~4.0
A.重力坝B.溢洪道C.水闸D.渡槽
A.1.0~1.6B.1.1~1.7C.1.2~1.8D.1.3~1.9
微信扫一扫,加关注免费搜题