PIC单片机产生警报声的程序。频率从1.8K-3.5K匀速增加，共有46个频点，每个频点扫频16个半周期，持续200mS。-PIC Singlechip alarms generated procedures. Frequencies from the uniform increase of 1.8K-3.5K, a total of 46 frequencies, each frequency sweep 16 semi-cycle, continuous 200mS.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001407s ]
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:0.094507s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001401s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001947s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001373s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003585s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001153s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003224s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014936s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001519s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 150565 [ RunTime:0.001312s ]
