光线在一年中所走的距离称为(  )。A.一兆 B.一光年 C.一纳米 D.一兆赫

作者: tihaiku 人气: - 评论: 0
问题 光线在一年中所走的距离称为(  )。
选项 A.一兆 B.一光年 C.一纳米 D.一兆赫
答案 B
解析 光年,长度单位,指光在一年时间中行走的距离。故本题答案选B。

相关内容:光线,距离,纳米

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