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【单选题】
根据《水利水电工程等级划分及洪水标准》(SL 252—2000)的规定，水利水电工程的等别根据其工程规模、效益及在国民经济中的重要性，可划分为（ ）等。A.
3
B.
4
C.
5
D.
6
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