4Gyoungho Lee, Jaesool Kwon, Sang-suk Park, etal. Journal of Research in Science Teaching , 2003, 40 (6): 585--603.
5Gil-Perez D, Carrascosa J. Science Education, 1990, 74: 531--540.
6Posner G J, Strike K A, Hewson P W, Gertzog W A. Seience Education, 1982, 66:211--227.
7Mansoor Niaz. Journal of Science Education and Technology, 2001, 10 (2):1112--1134.
8Mansoor Niaz, Eatado Sucre, Venezuela. International Journal of Science Education, 2002, 24 (4): 425--439.
9Michael J S. International Journal of Science Education, 2000, 22 (5):521--537.
10Savander-Ranne,C,Kolari,S. Promoting the concep-tual understanding of engineering students through visualization[J].Global Journal of Engineering Education,2003,(02):189-199.
