Physics Unit12: Sound (id: f48280c01)

admin · 发表于 2024-2-6 19:06:16

本题目来源于试卷: Physics Unit12: Sound，类别为通用国际物理

[单选题]
Sound vibrations with frequer el-f1f wlyu.s50iw6 ncy less tha)p(bd qbn xw0h7 /pxdy b(:(pudg1 2bin 20 Hz are called

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

参考答案: A

本题详细解析: 暂无

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