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月考复习:八上物理2.1声音的产生与传播,声学第一节重难点汇总!

  • 2026-09-27 02:02:39
月考复习:八上物理2.1声音的产生与传播,声学第一节重难点汇总!
八上物理2.1声音的产生与传播，声学第一节重难点汇总！
✅声音由振动产生
✅传播需要介质，真空不能传声
✅声速规律、回声考点
配套经典实验题，避开考试易错题，课前预习、考前复盘，快速吃透声现象！
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一轮专题外力作用,这样复习,你看怎样?

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000812s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001083s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000412s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000384s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000620s ]
  6. SELECT * FROM `set` [ RunTime:0.000342s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000778s ]
  8. SELECT * FROM `article` WHERE `id` = 516730 LIMIT 1 [ RunTime:0.000350s ]
  9. UPDATE `article` SET `lasttime` = 1790447432 WHERE `id` = 516730 [ RunTime:0.001922s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000322s ]
  11. SELECT * FROM `article` WHERE `id` < 516730 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000484s ]
  12. SELECT * FROM `article` WHERE `id` > 516730 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000371s ]
  13. SELECT * FROM `article` WHERE `id` < 516730 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000723s ]
  14. SELECT * FROM `article` WHERE `id` < 516730 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000520s ]
  15. SELECT * FROM `article` WHERE `id` < 516730 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000467s ]
0.084561s