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除非客機的速度足以擺脫地球引力,不然它到了升限就再也飛不上去了.假設一架B747-400的巡航速度在900km/h,那麼假設它能够飛出地球(其實絕對非飛不出去),到月球的時間將是:380000km÷900km/h約=422.2h約=17天半
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