陳榮華YUNG-HWA CHEN2014-10-272014-10-271979-06-??http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/11397兒童智能不足層次學習學習成效學習層次與增強因素對智能不足兒童加算學習成效之影響EFFECTS OF REINFORCEMENT AND LEARNING HIERARCHY ON ADDITION PERFORMANCE OF RETARDED AND NON-RETARDED CHILDREN