PARK CAR 倒车雷达的制作文件1：
有原理图和控制程序源代码，这里是不用数字显示而只用声音辨别距离的倒车雷达。MOD52是与汇编编译器一起使用的文件，*.HEX文件是编译好的文件，烧录到AT89C2051通电将按其内部的程序工作。图是用Protel 99设计的。更复杂的倒车雷达的制作文件2.3.4将陆续整理后上载
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001339s ]
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:0.088480s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002161s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001183s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000906s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003162s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000893s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004822s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015468s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001195s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 401861 [ RunTime:0.022384s ]
