Array ( [0] => Array ( [title] => L9A [link] => https://www.youtube.com/embed/2ylbehZ6AhA ) [1] => Array ( [title] => L9B [link] => https://www.youtube.com/embed/NKYvFW8x2zo ) [2] => Array ( [title] => L9C [link] => https://www.youtube.com/embed/TNbbs3YmZuc ) [3] => Array ( [title] => L9D [link] => https://www.youtube.com/embed/vD5kUZ4RFWU ) [4] => Array ( [title] => L9E [link] => https://www.youtube.com/embed/9RtM6OH9Vec ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第9講 機械設計製圖特徵-自由形式運用