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"Ancient Science and Technology and Ideology and Culture (1)" The Spread and Development of Ancient Civilization PPT Courseware 3
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"Wars and Conquests in the Ancient World" The Spread and Development of Ancient Civilizations PPT Courseware 5
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"Ancient Science and Technology and Thought and Culture (1)" The Spread and Development of Ancient Civilization PPT Courseware 6
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"Wars and Conquests in the Ancient World" The Spread and Development of Ancient Civilizations PPT Courseware 4
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"Ancient Science and Technology and Ideology and Culture (1)" The Spread and Development of Ancient Civilization PPT Courseware 2
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"Ultrasound and Infrasound" The World of Sound PPT Courseware 3
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"Electric Energy and Electric Power" Electric Energy and Electric Power PPT Courseware 2
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"Where Does Energy Come From" Energy and Life PPT Courseware 2
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