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当前学科：第三章城市市政公用设施
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在城市的防洪、防涝的设计标准中，通常洪水的频率用重现期倒数的百分比表示，例如重现期为40年的洪水，其频率为（）。
A . 1％
B . 1.5％
C . 2％
D . 2.5％
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