1 . 在
中,“
”是“
”的充要条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0b9b24c44f56961262b7ed05b5f0cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
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2 . “
”是“
”的必要不充分条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c97e1082c4cead21fdbf6fdda10c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
您最近一年使用:0次
3 . 设集合
,
,则“
”是“
”的必要不充分条件. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/043f3f5b5238b377373c4ab58be2fec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe123448fb2e5be04204cd98f64097e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed006b944ea64f970fee46e2f558467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23af61cd402b3789af2401bde9cbefe.png)
您最近一年使用:0次