Sommerfeld's wave expansion theory demonstrates that a spherical wave can be expanded as the superposition of plane simple harmonic waves.
索末菲关于波的展开理论证明，球面波可以展开为平面简谐波的叠加。
The wave equation having general forms of planar simple harmonic wave is deduced in this article. It is simple and accurate to solve wave equation by using this formula.
推导出了具有一般形式的平面简谐波的波动方程，利用此公式求解波动方程简单而且准确。
Transient and surge are the instant aberrance of the voltage and electric current on the simple alternating current wave circuit. surge and harmonic wave are the main manifestation.
瞬变和浪涌是正弦交流波电路上电压与电流的一种瞬时态的畸变。浪涌、谐波为主要的表现形式。
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