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习题

当前时间： 2026-07-19 17:18:47 分类：办公文件 评论(0)
习题

指出下列各集合之间的关系，并用Venn图表示：

A＝{x | x是四边形}，B＝{x | x是平行四边形}，C＝{x | x是矩形}，D＝{x | x是正方形}.

D⊂C⊂B⊂A，即D真包含于C真包含于B真包含于A.

Venn图：

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  1. 请求信息 : 2026-07-24 03:08:51 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/776480.html
  2. 运行时间 : 0.497588s [ 吞吐率：2.01req/s ] 内存消耗：4,646.20kb 文件加载：145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=743f47cd2b894e28a0134a80fbf53acc
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  1. CONNECT:[ UseTime:0.001165s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001657s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004764s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.014961s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001509s ]
  6. SELECT * FROM `set` [ RunTime:0.002760s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001573s ]
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  9. UPDATE `article` SET `lasttime` = 1784833731 WHERE `id` = 776480 [ RunTime:0.066601s ]
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  12. SELECT * FROM `article` WHERE `id` > 776480 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.038760s ]
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  15. SELECT * FROM `article` WHERE `id` < 776480 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.022577s ]
0.500975s