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【单选题】
橡胶坝的充排水时间是选择充排水水泵的台数和管径规格的主要参数，对动力设备选型起控制作用的是（）时间。A.
充水
B.
排水
C.
充水+排水
D.
泄洪
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A.
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B.
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C.
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D.
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A.
常用单位
B.
国际单位制（SI）
C.
参考单位
D.
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E.
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