A light year is a measure of ___. A. time B. distance C. speed D. mass 相关知识点: 试题来源: 解析 B。本题考查光年的概念。光年是长度单位,是计量天体间距离的单位,所以答案是 B。选项 A“time”是时间;选项 C“speed”是速度;选项 D“mass”是质量。反馈...
In astronomy, a light-year is a unit of ___. A. time B. distance C. speed D. weight 相关知识点: 试题来源: 解析 B。在天文学中,光年是距离的单位,所以选 B。A 选项“time”是时间;C 选项“speed”是速度;D 选项“weight”是重量,均不符合光年的定义。反馈 收藏 ...
This meansit takes light over four years to reach the star. Alpha Centauri is so far away.Questions 91—95: Please complete the summary of the passage above with not more than three words for each blank.请完成上面篇章的内容摘要。每空不超过三个单词。A light year is the distance that ...
百度试题 结果1 题目A light year is the distance travelled by light in how many Earth years?相关知识点: 试题来源: 解析 1 反馈 收藏
A light year is the distance that light travels in one year. Which of the following is not a correct description of a light year? A. It is a measure of distance. B. It is about 9.46 trillion kilometers. C. It is equal to one astronomical unit. D. It is a very large distance. ...
A light year is how far light can travel in one year. Light always travels at the same speed: about 300,000 kilometres per second. This is the fastest speed possible in the universe. Nothing travels faster.Imagine a star is 3,000 light years away. This means it would take3,000 years...
In the study of the universe, the term “light - year” is often used. A light - year is a unit of ___. Which option is correct? A. time B. length C. speed D. mass 相关知识点: 试题来源: 解析 B。解析:在天文学中,“光年”是一个长度单位,用于衡量天体之间的距离,而不是时...
结果一 题目 12. A light year is the distance light travels in one year at a(speed) of 299,792 kilometres per second. 答案 speed相关推荐 112. A light year is the distance light travels in one year at a(speed) of 299,792 kilometres per second....
For all these years, who is it that has decreed that they should remain in this world and has granted them the means of abiding? The answer is it is Allah who has given to each thing that which is suited to it and will guarantee its survival. Do you not see the beautiful green ...
A light year is the distance that light travels in one Earth year. 光前进的速度非常快 Light travels very fast, 大约每秒186000英里(或300000千米) about 186,000 miles or 300,000 kilometers every second. 光前进的速度快到...