本PPT讲述如何使用运算放大器,以及使用时应注意的问题,对于初学运放的人很有帮助-The PPT about how to use the op amp, and the use they should pay attention to the problem, for beginner person OPAMP helpful
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001031s ]
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:0.069753s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000979s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001136s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000924s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005283s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001147s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004239s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016056s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001170s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 204124 [ RunTime:0.017110s ]
