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Gold charts and coins PPT background image
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2019-02-20 02:00:00
Heart-shaped gestures and love PPT background pictures
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2019-01-19 11:00:00
"Analysis of the Impact of Human Activities on the Ecological Environment" Impact of Human Activities on the Biosphere PPT Courseware 3
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"Ancient Science and Technology and Ideology and Culture (1)" The spread and development of ancient civilization PPT courseware
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"Fast and Slow" The World of Movement PPT Courseware 5
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"Energy and Sustainable Development" PPT Courseware 3
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"Density" Quality and Density PPT courseware download
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"Parity" Concept and Properties of Functions PPT
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