来自龚宇的问题
1光年等于多少米?等于多少千米?
1光年等于多少米?等于多少千米?
1回答
2020-04-07 22:28
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孙少伟
光速c=299,792,458km/s.一光年等于94,605亿千米
,等于9,460,500,000,000米.
2020-04-07 22:30:37