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1 ?V字赛车 ...由?Space?Hopper?Studios?开发的一款竞速类新游《V字赛车》（Delta-V?Racing）近日已经上架至?App?Store，这款科幻风竞速作品从题材的选取到画面的刻画都迎合了当下众多玩家的口味，但是小编试玩一番...
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Other rockets of this class, such as Boeing’s Delta IV and the Atlas V, operated jointly by Boeing and Lockheed Martin, are children of the military-industrial complex. 然而同一级别的其他火箭，例如由波音公司与洛克斯勒马汀公司联合经营的波音德尔塔IV与阿特勒斯V火箭，是军工联合企业的子辈。 - 2
r So, let's remember that the amount by which we moved, t delta r, is approximately equal to v times delta t, OK, and just using the definition of a velocity vector. 所以记住移动的量△,约等于v*△,这是用速度矢量的定义。
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