80C51单片机中结合555电路实验和单片机定时器频率计实验,里面包含555定时器的datasheet和实验源程序-80C51 single-chip integration of 555 timer circuit experiments and the frequency of single-chip experiment, which contains 555 timer datasheet and experimental source
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.003235s ]
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:0.101653s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002126s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002350s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002509s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003821s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002259s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003906s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.017072s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.006445s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 149915 [ RunTime:0.001352s ]