采样模拟信号，转化成数字信号。
2）接口的连接问题。
3）LED显示器如何接入电路。
4) 如何进行显示控制。
-Sampling analog signals into digital signals. 2) interface connectivity problems. 3) LED display to access the circuit. 4) How to display control.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001376s ]
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:0.092684s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001249s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002093s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001226s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003614s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001072s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003342s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014764s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001330s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 212932 [ RunTime:0.001347s ]
