测试题：供应链的核心是什么？
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| VIDEOS | |||
| MP4 | N/A | 480P | Descargar |
| MP4 | N/A | 480P | Descargar |
| MP4 | N/A | 480P | Descargar |
| MP4 | N/A | 360P | Descargar |
| MP4 | N/A | 360P | Descargar |
| MP4 | N/A | 360P | Descargar |
| AUDIO | |||
| MP4 | N/A | mp4a.40.2 | Descargar |
| MP4 | N/A | mp4a.40.2 | Descargar |
| MP4 | N/A | mp4a.40.2 | Descargar |
| THUMBNAILS | |||
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JPEG | Origin Image | Descargar |
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