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【单选题】
以下定义并初始化一维数组的语句中正确的是A.
int arr1 [ ]={6,5,1,2,3};
B.
int [ ] arr2=new int[ ];
C.
int[ ] arr3=new int[ ]{6,5,1,2,3};
D.
int[ ] arr4;arr4={6,5,1,2,3};
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【单选题】根据下面短文内容，回答题。 His Own Way to Express Love Yesterday was our three-year anniversary. We didn&39;t do anything romantic; we just walked hand in hand and talked about our past and the future. This was pr...
A.
The writer's father.
B.
The writer's uncle.
C.
The writer's elder brother.
D.
The writer's boyfriend.
【单选题】根据短文的内容，回答下列题目 His Own Way to Express Love Yesterday was our three-year anniversary. We didn&39;t do anything romantic; we just walked hand in hand and talked about our past and the future. This was p...
A.
The writer's father.
B.
The writer's uncle.
C.
The writer's elder brother.
D.
The writer's boyfriend.
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A.
存在x∈R，使得x 2 +2x+5≠0，
B.
不存在x∈R，使得x 2 +2x+5≠0
C.
对任意x∈R，都有x 2 +2x+5≠0
D.
对任意x∈R，都有x 2 +2x+5=0
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