有一物体正在振动其每分钟振动900次则这种物体振动是�率是 hz此声音 被人耳听到因为人耳能听到声音的�率范围在 ．——青夏教育精英家教�—— Sketch Coloring Page

有一物体正在振动其每分钟振动900次则这种物体振动是�率是 hz此声音 被人耳听到因为人耳能听到声音的�率范围在 ．——青夏教育精英家教�—— Template

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tomski有一物体正在振动其每分钟振动900次则这种物体振动是�率是 hz此声音 被人耳听到因为人耳能听到声音的�率范围在 coloring

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