要制作一个圆锥形的漏斗,其母线长为20cm,要使其体积最大,则高

要制作一个圆锥形的漏斗,其母线长为20cm,要使其体积最大,则高为(  )

A.cm                                                      B.cm

C.cm                                                   D.cm

答案

 D

[

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