nth harmonic ratio 第N次谐波比 ; 次谐波比
harmonic to noise ratio 谐波噪声比 ; 谐波和噪声成份的比值 ; 谐波与噪声成分的比值 ; 谐噪比
harmonic voltage ratio 谐波电压含有率
harmonic amplitude ratio 谐波幅值比
harmonic filtering ratio 谐波滤除率
total harmonic filtering ratio 总谐波滤除率
second harmonic restraint ratio 二次谐波制动比
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