4.如图所示为沿水平方�的介质中的部分质点每相邻两质点间距离相等其中o为波源设波源的振动�期为t自波源通过平衡位置竖直�下振动时开始 Template




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tomski4.如图所示为沿水平方�的介质中的部分质点每相邻两质点间距离相等其中o为波源设波源的振动�期为t自波源通过平衡位置竖直�下振动时开始 coloring