当按下开关SP1，AT89S51单片机产生“叮咚”声从P1.0端口输出到LM386，经过放大之后送入喇叭。 -When pressing the switch SP1, AT89S51 Single-chip a " ding dong" sound from the output port P1.0 to LM386, after amplification into speakers after.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001206s ]
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:0.073507s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001790s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001182s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000890s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.002969s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000793s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003674s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.017302s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001058s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 321341 [ RunTime:0.012247s ]
