Online PBL _combined data

This is a set of combined data comparing the learning experiences of pre-clinical medical students in virtual problem-based learning (PBL) at the beginning and end of implementation of virtual PBL.本数据集为整合型数据集，旨在对比虚拟基于问题的学习（virtual problem-based learning，PBL）项目实施初期与末期，临床前医学生的学习体验。