三角巾的使用
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| VIDEOS | |||
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 360P | Download |
| AUDIO | |||
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| THUMBNAILS | |||
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JPEG | Origin Image | Download |
https://www.mdmooc.org/ccmedp/gb/video/detail?crs=11627&fmp=1
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