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问题详情

A first magnitude star is（）.

A、2.5 times as bright as a second magnitude star

B、3 times as bright as a second magnitude star

C、5 times as bright as a second magnitude star

D、10 times as bright as a second magnitude star

时间：2022-01-04 00:22 关键词：天文航海水路交通运输技能考试海船船员考试

答案解析

A

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