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已经证实,质子、中子都是由“上夸克”和“下夸克”两种夸克组成的,上夸克带电为2e/3,下夸克带电为-e/3,e为电子所带电量的大小,如果质子是由三个夸克组成的,且各个夸克之间的距离都为l,l=1.5×10-15m,则质子中有两个______夸克,上夸克和下夸克之间的静电力大小为______N.(k=9.0×109N•m2/C2,e=1.6×10-19C)
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