试题与答案

在研究天体之间的距离时，通常以 _________ 为单位．1光年约等于 ___

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题型：填空题

题目：

在研究天体之间的距离时，通常以 _________ 为单位．1光年约等于 _________ m．

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A

考点：光的传播速度与光年
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A. http://www.net.org/marine/csb/

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B. http://www.uky.edu/Agriculture/Entomology/ythfacts/entyouth/

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C. http://www.mountvernon,org/learn /index.cfm/

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F. http://www.nwf.org/

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