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【教材同步】重点精练5: 水的组成和净化(分享打印版)

  • 2026-09-23 03:00:38
【教材同步】重点精练5: 水的组成和净化(分享打印版)

文心老师的话

为方便同学们在学习期间对重难点的把握和巩固，“文心化学”特别推出“重点精练”，我们的精练题目按照2024版新教材要求，精心挑选，体量不大。花不多的时间，收获有效的提升，你值得一做！

快把公众号“文心化学”分享给你的朋友、同学们，让更多学子受益!

重点精练5：水的组成和净化

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【执照理论】M5教材第19章 考点思维导图(持续更新)

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000766s ] mysql:host=172.18.0.4;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000980s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000420s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000367s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000279s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000614s ]
  8. SELECT * FROM `article` WHERE `id` = 471794 LIMIT 1 [ RunTime:0.000337s ]
  9. UPDATE `article` SET `lasttime` = 1790109808 WHERE `id` = 471794 [ RunTime:0.001361s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000297s ]
  11. SELECT * FROM `article` WHERE `id` < 471794 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000435s ]
  12. SELECT * FROM `article` WHERE `id` > 471794 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000456s ]
  13. SELECT * FROM `article` WHERE `id` < 471794 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000787s ]
  14. SELECT * FROM `article` WHERE `id` < 471794 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000623s ]
  15. SELECT * FROM `article` WHERE `id` < 471794 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000604s ]
0.081505s