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【多选题】
混凝土坝的渡汛措施A.
预留缺口渡汛
B.
坝体导流
C.
临时断面挡水
D.
底孔泄水
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A.
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B.
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C.
Admission standards were higher.
D.
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A.
refreshing
B.
restoring
C.
renovating
D.
innovat ing
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