AVR mega16下的频率采集，高低频自动切换；所能测准的最高频率为70KHz-frequency sampling under AVR mega16,auto switching between high and low frequency the highest frequency which can be measured is 70KHz.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001294s ]
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:0.098807s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001215s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001971s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001219s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003702s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001111s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003206s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014745s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001305s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 313900 [ RunTime:0.001621s ]
