如图1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乒乓球�现乒乓球被多次弹开.这样做是为了 A.把音叉的微小 Template




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tomski如图1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乒乓球�现乒乓球被多次弹开.这样做是为了 a.把音叉的微小 coloring