试题与答案

正四面体的内切球和外接球的半径分别为r和R,则r:R为( ) A.1:2 B.1

题型:选择题

题目:

正四面体的内切球和外接球的半径分别为r和R,则r:R为(  )

A.1:2

B.1:3

C.1:4

D.1:9

答案:

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小题1:示例:它有时听妈的话,好好吃饭;有时淘气,不好好吃饭。(符合要求即可)小题1:示例:童心如画,描绘出五彩的画卷;童心如歌,吟唱出美妙的音符只要设计合理,表述正确通顺,书写认真即可。

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