Physics Unit12: Sound (id: eab8ff114)

本题目来源于试卷: Physics Unit12: Sound，类别为 国际高中通用物理

[单选题]
Sound vibrations with freqkd8e:1. wy)uqxrb l;z uencies greater than 20,000 Hn )tg6v u +;g9w9zu5n ij+eygez are called

A. infrasonics.
B. ultrasonics.
C. supersonics.
D. none of the above


参考答案:  B


本题详细解析: 暂无

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