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 河南成教 / 近世代数
正确率：100%

1、在整数加群（Z，＋）中，下列那个是单位元（ ）

A. 0

B. 1

C. -1

D. 1/n，n是整数
  积分
近世代数
 参考答案：
 佳题速递：
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