试题与答案

写出带有下面偏旁的字。 虫: ( ) ( ) ( ) ( ) 氵: ( ) ( )

题型:填空题

题目:

写出带有下面偏旁的字。

虫: (       ) (       ) (       ) (       )

氵: (       ) (       ) (       ) (       )

扌: (       ) (       ) (       ) (       )

答案:

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题型:问答题

小明在学习吉他演奏的过程中,发现琴弦发出声音的音调高低是受各种因素影响的,他决定对此进行研究.经过和同学们讨论,提出了以下猜想:

猜想一:琴弦发出声音的音调高低,可能与琴弦的长短有关

猜想二:琴弦发出声音的音调高低,可能与琴弦的横截面积有关

猜想三:琴弦发出声音的音调高低,可能与琴弦的材料有关

为了验证上述猜想是否正确,他们找到了表中所列几种规格的琴弦,因为音调的高低取决于声源振动的频率,于是小明又借来一个能够测量声源振动频率的仪器进行实验.

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(2)为了验证猜想二,应选用编号为______、______的琴弦进行实验.

编号材料长度(cm)横截面积(mm2
A600.76
B601.02
C1000.76
D尼龙801.02
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