横波只能在固体中传播,电磁波的传播不需要介质,可以在真空中传播,那为什么电磁波是横波 知乎 Template




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tomski横波只能在固体中传播,电磁波的传播不需要介质,可以在真空中传播,那为什么电磁波是横波 知乎 coloring