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 Sketch Coloring Page

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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tomski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 coloring

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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 sketch template

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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 sketch template

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