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【单选题】
设 R 包含于 A ✖ A , S 包含于A ✖ A, 则下述结论正确的是( )A.
若R和S是自反的，则R∩S是自反的
B.
若R和S是对称的，则R°S是对称的
C.
若R和S是反对称的，则R°S是反对称的
D.
若R和S是传递的，则R°S是传递的
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举一反三
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A.
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