这是看似简单的问题：给定空间两点坐标，让一个小球从起点滚动到终点，问小球沿着怎样的路径滚动的 最快？很多人会以为是直线，其实不然。该演示系统从模拟真实物体的客观行为出发，揭示问题的本质所 在。在演示中我们把小球滚动最快的轨迹称为“最速降线”。这是测试版，完全版可以到http://shizp.vicp.net索取-You can find the completed vision at:http://shizp.vicp.net
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002185s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.089531s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002442s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001938s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002156s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003932s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002094s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003395s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015173s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002411s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 111654 [ RunTime:0.001167s ]
