求翻译：当注入电流的频率在一定范围内变动时, 可得相应谐波阻抗- 频率的分布图, 从图中曲线的谷值和峰值可确定该节点发生串、并联谐振的频率。是什么意思？

When the injection current frequency change within a certain range, the corresponding harmonic impedance - frequency distribution diagram, the curve from Figure valley and the peak to determine the node string, the parallel resonant frequency.

When the Injection current frequency within a range, you can change a corresponding impedance - frequency harmonics of the distribution curve, in the diagram, the valleys and peaks can be determined that the node that string, and the resonant frequency.

When pours into the electric current the frequency changes when certain scope, may result in the corresponding overtone impedance - frequency the distribution map, from the chart curvature valley value and the peak value may determine this node has the string, the antiresonance frequency.

When injecting current frequency of change within a certain range, harmonic impedance-frequency distribution maps, from the Valley and the peak of the curve in the diagram to determine which series and parallel resonance frequency.

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