2011·四川成都·一模
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1 . a、b为实数,集合
表示把集合M中的元素x映射到集合N中仍为x,则![](https://img.xkw.com/dksih/QBM/2010/8/23/1569819628273664/1569819633262592/STEM/7936f2800a3546148d8fe1c4d9a61311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672cb8c3772969686040b857c826c907.png)
![](https://img.xkw.com/dksih/QBM/2010/8/23/1569819628273664/1569819633262592/STEM/7936f2800a3546148d8fe1c4d9a61311.png)
A.1 | B.0 | C.-1 | D.±1 |
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A.1 | B.0 | C.-1 | D.±1 |