Array ( [0] => Array ( [title] => L62A [link] => https://www.youtube.com/embed/05JUgRIFglQ ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第62講|Lecture 12 Electrodynamics and Relativity|12_3B 12_3_3 The Field Tensor