electromagnetic wave propagation velocity
electromagnetic wave propagation velocity
电磁波传播速度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The paper studies the concepts of phase velocity and group velocity on electromagnetic wave propagation and discusses the relation between signal conveyance and energy conveyance.
文章研究了电磁波传播的群速与相速概念，论证了信号传送与能量传递的必然联系。
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