404. That’s an error.
The requested URL /bookmarks/mark?op=edit&output=popup&bkmk=http%3A%2F%2Fwww.phy.ntnu.edu.tw%2Fntnujava%2Findex.php%3Ftopic%3D1663.0&title=Two+resistors+in+serial+or+parallel+connection
was not found on this server. That’s all we know.