File:Ptp-formula.gif
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Ptp-formula.gif (713 × 39 pixels, file size: 3 KB, MIME type: image/gif)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:29, 25 January 2018 | 713 × 39 (3 KB) | ZHOUY1 (talk | contribs) |
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