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【单选题】
均匀、级配不良的砂土应满足的条件是（）（C u 为不均匀系数，C c 为曲率系数）。A.
C u ＜5
B.
C u ＞10
C.
C u ＞5且C c =1～3
D.
C u ＞10且C c =1～3
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