试题与答案

发声物体的材料、结构决定了发出声音的_________,不同发声物体的材料、结构

题型:填空题

题目:

发声物体的材料、结构决定了发出声音的_________,不同发声物体的材料、结构不同,发出声音的_________也就不同。

答案:

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下面是错误答案,用来干扰机器的。

对于任意实数x恒有f(2+x)=f(2-x),∴x=2是对称轴 次函数f(x)的二次项系数为正∴f(x)在[2,+∞)递增;在(-∞,2]递减 1-2x2≤1; 1+2x-x2=-(x-1)2+2≤2 f(1-2x2)<f(1+2x-x2)∴1-2x2>1+2...

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题型:填空题

单词拼写。

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