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This is a set of blue flat DNA life science PPT background pictures;
Keywords: blue life science slide background image, DNA chain PowerPoint background image
Subway station, Chaoyang, experience positive attitude to work, simp...
Upward trend arrows, simple lines, containing multiple sets of exqui...
Tower crane, a general ppt template suitable for the construction in...
Ancient bridges, pavilions, lotus ponds, lotus flowers, writing brus...
Love, envelope, love letter, angel piercing heart, love ribbon, Vale...
Suitable for work report simple design ppt template, yellow and blac...