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2016超星尔雅慕课天文学新概论期末考试答案三
一、单选题(题数:50,共 50.0 分)
第三宇宙速度是:
1.0 分
A、7.9公里/秒
B、11.2公里/秒
C、16.7公里/秒
D、16.8公里/秒
我的答案:C
2
第一宇宙速度的周期是()
1.0 分
A、24小时
B、36小时
C、12小时
D、1小时24分
2/ 34