หลักสูตรฟิสิกส์ประยุกต์
Notice: Undefined variable: conn in /var/www/html/phys/per_aca.php on line 17
Fatal error: Uncaught Error: Call to a member function query() on null in /var/www/html/phys/per_aca.php:17
Stack trace:
#0 {main}
thrown in /var/www/html/phys/per_aca.php on line 17