正弦波形赋予了通过水道的结构轮廓的形状。
A sinusoidal waveform provides the structural silhouette shape across the channel.
给出了正弦波逆变器的主电路结构，分析了控制电路及电压前馈的工作原理。
The structure of the sine wave inverter is given, the working principles of the control circuit and voltage feedforward are analyzed.
这个电路以最简洁的结构实现了高纯净度正弦波输出，而且在较低的频率上也是如此。
This circuit provides high purity sine-wave output down to low frequencies with minimum circuit complexity.
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