信号与系统――奥本海姆（中文版），主要是清晰版，很清晰，比超星打印的要清晰。书就不用给介绍了吧，大家都知道。-Signals and Systems- Oppenheim (Chinese version), the main version is clear, it is clear, than Chaoxing printing should be clear. Book would not have to introduce a bar, as we all know.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001026s ]
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:0.062928s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000925s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001141s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000833s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003097s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000798s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003598s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015306s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001139s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 130054 [ RunTime:0.011240s ]
