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"Ethylene and Organic Polymer Materials" Organic Compounds PPT (Lesson 2 Hydrocarbon Organic Polymer Materials)
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"Periodic Law of Elements" Periodic Law of Elements in Material Structure PPT (Periodic changes in the properties of elements in Lesson 1)
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"Success" PPT
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Slideshow material with silhouettes of people
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2019-02-01 20:00:00
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