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教你如何入门业余无线电(PPT版本),学习收藏起来!

  • 2026-11-07 11:56:13
教你如何入门业余无线电(PPT版本),学习收藏起来!

来源：四川省无线电协会 版权归原作者所有。如有不妥，请联系删除。

● 59页PPT，全面了解“无线通信原理”
●一个“10后”的无线电科普：对讲机、短波、车台与黑广播
●为什么美军不怕军用电台被对方缴获？答案就在电台这个旋钮上！
● 对讲机管制将升级？任何对讲机都属于受管制通讯设备，禁止随便带出国！
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000570s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000768s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000406s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000401s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000539s ]
  6. SELECT * FROM `set` [ RunTime:0.000283s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000643s ]
  8. SELECT * FROM `article` WHERE `id` = 502272 LIMIT 1 [ RunTime:0.000413s ]
  9. UPDATE `article` SET `lasttime` = 1794130463 WHERE `id` = 502272 [ RunTime:0.001502s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000329s ]
  11. SELECT * FROM `article` WHERE `id` < 502272 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 502272 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000394s ]
  13. SELECT * FROM `article` WHERE `id` < 502272 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000453s ]
  14. SELECT * FROM `article` WHERE `id` < 502272 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000562s ]
  15. SELECT * FROM `article` WHERE `id` < 502272 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000613s ]
0.111440s