| 摘要 |
<p>The invention relates to a self-correcting safety system for test-type exams comprising four superimposed sheets, the front of the first and fourth pages being coincident and carbonless except for the part intended for checking answers in which the correction marker is printed on the fourth page. The back of the first page has an overlay system that makes it possible to check incorrect answers in the second page only, the correct answers having no overlay. Hence, the wrong answer checks can be seen by removing the second page. The second and third pages only include an area for checking answers, the perimeter of the third page being glued to the fourth page to conceal the correction marker printed thereon. The back of the third page has an overlay system so that the checks made in the first page can be seen on the fourth page. The system is closed by gluing the first and fourth pages by their perimeter, leaving a free space for the tab of the second page to stick out for removal of said page.</p> |
