可用于测量10000000赫兹频率范围内的方波，基于单片机8051.精度为0.01 -Can be used to measure the frequency range of 10 million Hz square wave, based on 8051 microcontroller. Accuracy 0.01
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001931s ]
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:0.140518s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001699s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001825s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005080s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001481s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016232s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001433s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 186160 [ RunTime:0.001521s ]
