pulse duration modulation-frequency modulation
...metering pulse duration modulation 脉波波期调变遥测 pulse duration modulation-frequency modulation 脉冲持续时间调制调频 ..
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pulse-width modulation-frequency modulation
PWM =Pulse-Width Modulation 脉宽调制 pulse-width modulation-frequency modulation 脉冲持续时间调制调频 pulse-width modulation? (PWM) 脉宽调制 .
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