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设函数

单选题
2021-07-17 20:28
A、<img src="http://s3.qsxt.info/exams/201906/b83fa882-b4ef-4b6c-bfdc-91fe51864a52.png"/>
B、<img src="http://s3.qsxt.info/exams/201906/2ccab0f6-c8b4-457d-87c8-b23139de231f.png"/>
C、<img src="http://s3.qsxt.info/exams/201906/dfad3b51-06cd-44f1-a6e8-d9c5f9a965b1.png"/>
D、<img src="http://s3.qsxt.info/exams/201906/89f6302b-a50e-417e-878f-541cd9a5e9af.png"/>
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正确答案
A

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