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[单选题]
设A={1,2,3,4}，关于R={<1,1>,<2,2>,<2,3>,<3,2>,<3,3>,<4,4>}的描述中，不正确的是（ ）
A
R是A上的偏序关系
B
R是A上的等价关系
C
商集A/R={{1},{2.3},{4}}
D
R所确定的划分有3个划分块
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参考答案
试题答案：
A
答案解释：
R不满足反对称的条件。
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