物理与数学-畅读网

　　　　

物理与数学

作者：纸上魔方

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这是一套有趣的数学科普丛书，涉及美食、人体、医学、建筑、物理、军事、交通、古代数学等与数学相关的领域，内容包罗万象，故事生动有趣，是培养孩子数学兴趣和数学思维的绝佳读物。本套丛书运用生动活泼的文字、幽默诙谐的漫画以及贴近生活的例子，将复杂深奥的数学知识化繁为简，让孩子一看就明白，一学就会用！声音传播的速度有多快？空气可以称重吗？同样体积的水和油哪个重？什么是“九牛二虎之力”？为什么逆风行进速度慢了？ …… 让我们一起探寻物理中的数学真相吧！

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SHOW FULL COLUMNS FROM `ls_nav` [ RunTime:0.001259s ]
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SHOW FULL COLUMNS FROM `ls_friendly_link` [ RunTime:0.002304s ]
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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 9 LIMIT 1 [ RunTime:0.000691s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 70 LIMIT 1 [ RunTime:0.001330s ]
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:0.001039s ]
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:0.000909s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1756291364 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:1.052488s ]

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