中小学生必会的科普新知-畅读网

　　　　

中小学生必会的科普新知

作者：李慕南

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《中小学生必会的科普新知》别出心裁，精选出诸多常见的科学常识，通过生动有趣的小故事，帮助孩子发现问题，探究缘由，从而留心科学，爱上科学，步入神奇的科学世界！ *只吃竹子吗？竹子是草还是树呢？真的有“鬼火” 吗？铅笔是铅做的吗？ ……科学无处不在，疑问时时发生。在孩子们的眼里，世界精彩纷呈，充满神秘。遇到不明白的事，他们总有着浓浓的好奇心理和探究兴趣。

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SHOW FULL COLUMNS FROM `ls_goods_category` [ RunTime:0.006557s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.012174s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 2 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.006591s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`is_show`,`is_recommend` FROM `ls_goods_category` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 3 ORDER BY `sort` DESC [ RunTime:0.010861s ]
SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.019796s ]
SELECT `id`,`name`,`pid`,`image`,`level`,`link`,`module`,`is_show`,`is_recommend` FROM `ls_nav` WHERE `is_show` = 1 AND `del` = 0 AND `level` = 1 ORDER BY `id` ASC,`sort` DESC [ RunTime:0.024347s ]
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SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.002387s ]
SELECT * FROM `ls_friendly_link` WHERE `is_show` = 1 AND `del` = 0 ORDER BY `id` DESC,`sort` DESC [ RunTime:0.003528s ]
SHOW FULL COLUMNS FROM `ls_goods` [ RunTime:0.002956s ]
SELECT * FROM `ls_goods` WHERE `id` = 7414 AND `status` = 1 LIMIT 1 [ RunTime:0.005480s ]
UPDATE `ls_goods` SET `click_count` = 302 , `update_time` = 1771376730 WHERE `id` = 7414 [ RunTime:0.005739s ]
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SHOW FULL COLUMNS FROM `ls_ad` [ RunTime:0.003617s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 46 LIMIT 1 [ RunTime:0.002506s ]
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:0.002365s ]
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:0.003512s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1771376670 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:1.266880s ]

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