点击下载:西安建筑科技大学:《大学英语》课程教学资源(现代大学英语,PPT课件讲稿,第二册)lesson15_background information
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Lesson 15-The riddle of time .evelopment of Clocks-Water Clocks Early water clock W BT E To be continued on the next page.Lesson 15—The Riddle of Time W B T L E To be continued on the next page. I. Development of Clocks—Water Clocks
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点击下载:西安建筑科技大学:《大学英语》课程教学资源(现代大学英语,PPT课件讲稿,第二册)lesson15_background information
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