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【单选题】
给出 四个结论: 1{ 1 , 2 , 3 , 1 }是由 4 个元素组成的集合 2 集合{ 1 }表示仅由一个 “1” 组成的集合 3{ 2 , 4 , 6 }与{ 6 , 4 , 2 }是两个不同的集合 4 集合{大于 3 的无理数}是一个有限集 其中正确的是A.
. 只有 ③④
B.
只有 ②③④
C.
只有 ①②
D.
. 只有 ②
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