题目内容：
设M是实数集，代数运算是普通加法，下列映射是M的自同构的是选项
A:x→x2
B:x→sin x
C:
D:
参考答案：
选择题：设M是实数集，代数运算是普通加法，下列映射是M的自同构的是选项A:x→x2B:x→sin xC:D:
- 题目分类：数学与应用数学
- 题目类型：选择题
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选项
A:x→x2
B:x→sin x
C:
D:
选项
A:x→x2
B:x→sin x
C:
D:
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