葉建德劉祥通2014-10-272014-10-272005-06-??http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/7832比率速率工作單為基礎的訪談個案研究RateSpeedStructured-taskCase study一位七年級學生的比率構念Seventh Grader's Rate Construct--From His Performance on Solving Speed Problems