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【单选题】

等差数列an)中,a5<O.a6>0,且a6>|a5|,Sn是前n项之和.则().

A.S1,S2,S3均小于0,而S4,S5,…均大于0
B.S1,S2,…,S5均小于0,而S6,S7,…均大于0
C.S1,S2,…,S9均小于0,而S10,S11,…,均大于0
D.S1,S2,…,S10均小于0.而S11,S12.…均大于0
E.以上结论均不正确
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