如图所示在探究“声音是由物体振动产生的 实验中将正在�声的音叉紧靠悬线下的轻质小球�现小球被多次弹开.这样做是为了a.把声音的振动时间 Template




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tomski如图所示在探究“声音是由物体振动产生的 实验中将正在�声的音叉紧靠悬线下的轻质小球�现小球被多次弹开.这样做是为了a.把声音的振动时间 coloring