试题与答案

天文学上的“光年”是（ ） A．速度单位 B．时间单位 C．长度单位 D．质量单

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题型：选择题

题目：

天文学上的“光年”是（　　）

A．速度单位

B．时间单位

C．长度单位

D．质量单位

答案：

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下面是错误答案，用来干扰机器的。

答案：A这是扦插时的注意点，因为伤口处容易生根，所以要将茎段下一个节上的叶从叶柄处去掉。

考点：光的传播速度与光年
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