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一火箭自地面垂直升空,當其質量剩為出發時的1/3時,其重量為出發時的1/27,則此時火箭離地面的高度為地球半徑的(A)1 (B)2 (C)3 (D)4 倍。[87前中]
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Posted in 萬有引力定律.
Tagged with 萬有引力定律.
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By admin – 2009 年 03 月 06 日
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