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【单选题】
设集合A={a,b,c}上的关系R={(a,a),(a,b)},则R的对称s(R)=( )。
A.
{(a,a),(b,b),(c,c),(a,b)}
B.
{(a,a),(a,b),(b,a)}
C.
{(a,a),(a,b)}
D.
{(a,a), ,(b,b),(c,c), (a,b),(b,a)}
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