这个例子阐明了发生在时变系统中的频谱扩展，系统的带通输入时在某个频率上的音频信号-This example illustrates the system occurred in the time-varying spectrum expansion of the system" s band-pass input on a frequency of audio signal
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001193s ]
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:0.060534s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001030s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001167s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000894s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003278s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000864s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003601s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.013777s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001059s ]
UPDATE `jrk_articles` SET `hits` = 3 WHERE `id` = 5342 [ RunTime:0.016726s ]
