| 摘要 |
PURPOSE:To make it possible for a user to prepare arbitrarily and easily, in conformity with conditions of a solver, questions/answers in a picture book, a study card or others which are so prepared that the correctness or incorrectness thereof can be checked up by a method wherein a light of a check pen touching a column of an answer with a mark of a circle or a cross is turned ON, or the like. CONSTITUTION:An electroconductive felt-tip pen which is constructed of an ink filled part 1 and an ink outflow part 2 and wherein electroconductive ink is held in the ink filled part 1 and the surface resistance value of a coat of the electroconductive ink is made 3MOMEGA/square or below. |
