太阳自转的平均周期是几天?太阳自转的平均周期是几天?A.30 B.28 C.27 D.29银河系大小约几光年?A.不足10 B.1000 C.10万 大约1000万1光年大约是什么天文单位?A.3.3 B.38 C.6.3万 D1.5亿

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