基于问题的学习模式(PBL)是一种在建构主义学习理论基础上产生的教学模式。
Problem based learning (PBL) method is a teaching mode based on the learning theory of building structure.
基于此，笔者选择PBL作为网络课程的教学设计模式，着重对网络课程的核心问题“学习内容”与“学习活动”的设计开发进行了探讨。
So the paper chooses the PBL as the module of ID, moreover emphasizes the design of learning contents and learning activities in web based course.
第四部分是对基于问题解决的化学学习模式的构建，从基于问题解决的化学学习的涵义、模型构建、学科特点、教学策略和学习策略五个方面进行了论述。
The fourth part constructs the model of problem-solving based learning of chemistry, and discusses its meaning, its modeling, its characters, and its teaching and learning strategies.
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