老师在演示如图所示的齿轮拨动纸片的实验中纸片�出的声音是靠纸片振动产生的若三种齿轮拨动纸片时�出了dou的三个音调那么�出xi7音调 Template




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tomski老师在演示如图所示的齿轮拨动纸片的实验中纸片�出的声音是靠纸片振动产生的若三种齿轮拨动纸片时�出了dou的三个音调那么�出xi7音调 coloring