| 摘要 |
<p>The teaching aid is for technical drawing instruction, comprising a first set of sheets joined together, accommodating information and/or tasks to be performed by the pupil. A second set is attached to the first, for the solutions to be inserted by the pupil. The two sets of sheets (1,2) are separate from each other and have the same size and shape in the working plane. They are joined by a protective casing roughly three times the sizes of a set of sheets, so that the outer part of the casing, together with the sheet set it accommodates, can be folded inwards.</p> |
