摘要
线性受控原是双口、有源电阻元件。对这类元件的认识与理解历来是学生学习的难点。本文就受控源的这一特点，明确以二重性概念阐述受控源有别于独立源的基本特性。
The basic features of the controlled source different from that of the independent one are expounded with the emphasis on the concept of duality so that the students can understand this kind ofresistance components when attending class.
