单项选择题
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
A.10~15B.12~17C.14~19D.16~21
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