Fire Engine Siren - 搜索视频

the siren of a fire engine that is driving northward at 300 ms emits a sound of frequency 2000 hz a truck in front of this fire engine is moving northward at 200 ms a what is the frequency of the si 2

the siren of a fire engine that is driving northward at 300 ms emits a sound of frequency 2000 hz a truck in front of this fire engine is moving northward at 200 ms a what is the

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