通信系统仿真，有AM,PSK等调制，还有其他文件（system环境下），是仿真文件-Communication System Simulation, and AM, PSK modulation, etc., as well as other documents (system environment)
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002663s ]
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:0.087535s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002646s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002188s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002115s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003680s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.003531s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003565s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015108s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002359s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 208775 [ RunTime:0.001197s ]
