三个特殊映射：单射、双射、满射
TIP! Right-click and select "Save link as..." to download.
| VIDEOS | |||
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 480P | Download |
| MP4 | N/A | 360P | Download |
| MP4 | N/A | 360P | Download |
| MP4 | N/A | 360P | Download |
| AUDIO | |||
| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
| THUMBNAILS | |||
|
JPEG | Origin Image | Download |
第一次做视频，就是自己遇到的问题做了一个视频，方便和我有一样问题的小伙伴，希望能帮到你。
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