问题
单项选择题
Which property does R possess ( ) let A={1,2,3,4} and let R ={＜1,2＞,＜2,2＞,＜3,4＞,＜4,1＞,＜4,2＞}
A．symmetry
B．antisymmetry
C．asymmetry
D．reflexivity
答案
参考答案：B
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Which property does R possess ( ) let A={1,2,3,4} and let R ={＜1,2＞,＜2,2＞,＜3,4＞,＜4,1＞,＜4,2＞}
A．symmetry
B．antisymmetry
C．asymmetry
D．reflexivity
参考答案：B