波长为60 M和17 M的两列声波在空气中传播时下列叙述中正确的是 A．波长60 M的声波比波长17 M的声波传播速度慢 B．波长60 Sketch Coloring Page

波长为60 M和17 M的两列声波在空气中传播时下列叙述中正确的是 A．波长60 M的声波比波长17 M的声波传播速度慢 B．波长60 Template

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