2D3D
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1 Likes47 DownloadsApril 24, 2021
The chemical bond is made up of ready-made Carrefour cotton buds with a diameter of 2.5mm, cotton buds are full of toughness and not easy to break. Among them are hydrogen atom, carbon atom, nitrogen atom and oxygen atom. they can be manufactured by 3D printer.
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1 Likes47 DownloadsApril 24, 2021
1 Likes47 DownloadsApril 24, 2021