电工电路自学宝典-畅读网

　　　　

电工电路自学宝典

作者：韩雪涛

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科学技术 >> 工业技术

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内容简介:

本书是一本全面介绍电工电路识读技巧与应用的自学宝典。本书采用全彩+全图+微视频的全新讲解方式，系统全面地介绍电工电路的功能特点、应用与识读技巧。通过本书的学习，读者可以了解并掌握各种类型电工电路的结构、功能、识读方法及应用。本书开创了全新的微视频互动学习体验，使微视频教学与传统纸质的图文讲解互为补充。

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SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.005013s ]
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SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.011334s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 45 LIMIT 1 [ RunTime:0.005418s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 11 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.006003s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 14 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.008828s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1771840346 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:2.202491s ]

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