Array ( [0] => Array ( [title] => L8A [link] => https://www.youtube.com/embed/zWB6yFYs_gM ) [1] => Array ( [title] => L8B [link] => https://www.youtube.com/embed/-F-n7b-huI8 ) [2] => Array ( [title] => L8C [link] => https://www.youtube.com/embed/_v5e41vz0FI ) [3] => Array ( [title] => L8D [link] => https://www.youtube.com/embed/Xb9QLukWsMc ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第8R講 Marginal rate of technical substitution