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出场人物:张老师:退休高工,对变频器的应用及推广颇有研究。小孙:蓝天公司电气工程师课堂风格:深入浅出。4电力场效应晶体管
Appearances: Zhang: retired senior engineer, the application and promotion of the drive quite a lot of research. Xiao-Sun: Blue Sky Electrical Engineer Classroom Style: simple. 4 power field effect transistor