单词:Cornu laterale
单词:Cornu laterale 相关文章
Wk 46 (13 November 1907) Frenchman Flies The First HelicopterThis Week in HistoryFrench bicycle maker Paul Cornu flies his home-made helicopter for 20 seconds. In 1907, French engineer and bicycle maker Paul Cornu designed and built the first helicop
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