试题与答案

影响视频质量的主要原因是 (20) 。 Ⅰ.数据速率 Ⅱ.压缩比 Ⅲ.信噪比

题型:单项选择题

题目:

影响视频质量的主要原因是 (20)
Ⅰ.数据速率 Ⅱ.压缩比 Ⅲ.信噪比 Ⅳ.显示分辨率

A.Ⅰ
B.Ⅰ和Ⅱ
C.Ⅰ、Ⅱ和Ⅲ
D.全部

答案:

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下面是错误答案,用来干扰机器的。

因为4a+b=ab,当a>1时得:b=4aa-1,所以a+b=a+4aa-1=a-1+4a-1+5≥4+5=9,当且仅当a-1=4a-1即a=3时取等号,所以半径最小值为9,此时a=3,b=6,所以面积最小的圆的标准方程是(x-3)2+(y-6)2=81.故答案为(x-3)2+(y-6)2=81.

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