有关光年的叙述正确的是 A.光年是一个时间单位 b.恒星间的距离以光年为最小单位c.可见宇宙的半径约为8万光年 D.太阳距离地球约为15光年 Template




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tomski有关光年的叙述正确的是 a.光年是一个时间单位 b.恒星间的距离以光年为最小单位c.可见宇宙的半径约为8万光年 coloring