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          歡迎訪問作文范文網

          高考作文素材點撥:太空一小步,我國一大步

          作者:范文大全來源:實用范文網 時間:2019-04-14 閱讀: 字體: 在線投稿

            高考作文素材點撥:太空一小步,中國一大步
            【素材傳真】
            2008年9月25日,中國在酒泉衛星發射中心用長征二號F火箭將神舟七號飛船送上太空,3名航天員翟志剛、劉伯明、景海鵬開始了中國第三次載人航天之旅。
            從神五的一人到神六的二人,再到神七的三人,神七突破的不僅是飛行人數的增加,更是中國載人航天關鍵技術的重大跨越:神七完成了中國航天員首次出艙任務,實現“太空漫步”的夢想。
            除了“出艙”,中國航天員還在這次任務中首次在外太空進行空間科學試驗——固體潤滑材料和太陽電池基底材料艙外暴露實驗,而把實驗樣品從艙外取回來是航天員出艙活動的主要內容。出艙活動結束后,還在軌釋放了一顆小衛星。這顆小衛星圍繞軌道艙進行伴隨飛行,這是中國首次在軌釋放小衛星,也是首次進行伴飛試驗。而于今年上半年發射的中國首顆中繼衛星“天鏈一號”,將在神七任務期間得到充分驗證。中繼衛星的應用,將大大提高中國測控網的覆蓋率和效率。
            “難度前所未有,挑戰前所未有”,神七航天員在太空邁出的一小步,將是中國載人航天工程向前邁出的一大步。邁出這一步,需要智慧,更需要勇氣。


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