| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a learning set which is excellent in the convenience capable of quickly erasing a desirable part without soiling the surrounding when correcting an answer, writing a new answer and, moreover, erasing the wide range easily and reliably, and is excellent also in the reusability. <P>SOLUTION: The learning set comprises: a writing tool of storing an ink which can be decolored by heating; and a problem collection note provided with a writing part for writing the answer with the writing tool. The problem collection note contains such a display part as to explain that a handwriting formed by the writing tool can be erased by heating. The problem collection note has an answer part which allows the answer to emerge by heating. <P>COPYRIGHT: (C)2009,JPO&INPIT |
