... pulse duration 脉冲持续时间 pulse frequency modulation 脉冲频率灯 pulse length 脉冲持续时间 ...
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...quency modulation,linear frequency modulation, 线性档 pulse frequency modulation,pulse frequency modulation, 脉冲频率灯 ; 脉冲档 modulation frequency,modulation frequency 灯频率 ..
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