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九年级重要知识点总结——电学基础

  • 2026-11-06 21:35:42

九年级重要知识点总结——电学基础

电学是初三物理第一道大关，很多孩子一接触电路就乱。
这套手写板书，把电学底层知识点全部梳理清楚：
✔认识电路：通路、断路、短路，串并联区分
✔电流：电流表规则、串并联电流规律
✔电压：电压表用法、经典易错题辨析
✔电阻：影响因素、滑动变阻器必考要点
✔串并联对比+电表测量判断方法

#厦门物理#初中物理#教学

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高二数学圆锥曲线期中模拟真题汇编,53 道原卷题

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000633s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001032s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000482s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000377s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000561s ]
  6. SELECT * FROM `set` [ RunTime:0.000283s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000657s ]
  8. SELECT * FROM `article` WHERE `id` = 539256 LIMIT 1 [ RunTime:0.000362s ]
  9. UPDATE `article` SET `lasttime` = 1793987945 WHERE `id` = 539256 [ RunTime:0.001277s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000343s ]
  11. SELECT * FROM `article` WHERE `id` < 539256 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000427s ]
  12. SELECT * FROM `article` WHERE `id` > 539256 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000364s ]
  13. SELECT * FROM `article` WHERE `id` < 539256 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000596s ]
  14. SELECT * FROM `article` WHERE `id` < 539256 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000521s ]
  15. SELECT * FROM `article` WHERE `id` < 539256 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000588s ]
0.088445s