题目内容（请给出正确答案）

[主观题]

Which of the following statements is NOT necessarily true regarding mechanical waves？

A、They are sinusoidal in nature.

B、They carry energy.

C、They require a medium through which to propagate.

D、The wave speed depends on the properties of the medium in which they travel.

提问人：网友rexchen 发布时间：2022-01-06

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