| 摘要 |
<p>Teaching device tests knowledge requiring written or graphic answer. It consists of a flat housing and support for a replaceable sheet. There is a column for questions as well as a column for correct answers arranged adjacent each other. A column for writing can be seen through an opening in the front of the housing. The support for the question and answer sheet is formed by a second plate (5) which can be moved below the space for writing (6). A sprung detent is placed in the space between the cover plate (7) and the second plate (5), and swivels in the direction of movement of both pates (5, 7).</p> |
