31.如图所示在双曲线的两个焦点f1和f2上放置两个�率相同的波源它们激起的波的波长为4cm就图中abcd四个质点的振动下列说法 Template




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tomski31.如图所示在双曲线的两个焦点f1和f2上放置两个�率相同的波源它们激起的波的波长为4cm就图中abcd四个质点的振动下列说法 coloring