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成电858系列|2018年真题及解析(超哥团队原创整理)

  • 2026-11-03 01:57:39
成电858系列|2018年真题及解析(超哥团队原创整理)
01
成电858《信号与系统》官方参考教材

02
2018真题全面解析

成电2018年858信号与系统考研真题整体难度很低，计算量很小，题目常规。但是考了判断拉普拉斯系统的题目，这种题目一共考过两次，属于简单考点，但是书上没有详细解释如何判断，所以需要读者们自行扩展学习（这部分自主学习的内容，咱们的讲义里是有的）。

03
2018年成电858真题
04
2018年成电858真题解析

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观行北京:2026年北京市直遴选笔试考前冲刺手册

基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000512s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000649s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000419s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000395s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000554s ]
  6. SELECT * FROM `set` [ RunTime:0.000301s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000600s ]
  8. SELECT * FROM `article` WHERE `id` = 532457 LIMIT 1 [ RunTime:0.000353s ]
  9. UPDATE `article` SET `lasttime` = 1793647789 WHERE `id` = 532457 [ RunTime:0.000937s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000316s ]
  11. SELECT * FROM `article` WHERE `id` < 532457 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000425s ]
  12. SELECT * FROM `article` WHERE `id` > 532457 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000436s ]
  13. SELECT * FROM `article` WHERE `id` < 532457 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000697s ]
  14. SELECT * FROM `article` WHERE `id` < 532457 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000547s ]
  15. SELECT * FROM `article` WHERE `id` < 532457 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000765s ]
0.099071s