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Warning: mysql_select_db(): supplied argument is not a valid MySQL-Link resource in /home/art21/www/answer/code10-2-3answer.php on line 9

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Warning: mysql_error(): supplied argument is not a valid MySQL-Link resource in /home/art21/www/answer/code10-2-3answer.php on line 12
エラー番号： エラーメッセージ：
Warning: mysql_close(): supplied argument is not a valid MySQL-Link resource in /home/art21/www/answer/code10-2-3answer.php on line 17