短語詞組短語pwm pulse modulate pwm 脈沖調(diào)制PWM Pulse Width Modulate 脈沖寬度調(diào)制PWMpulse width modulate pwm 脈沖寬度調(diào)制pulse width modulate wave pwm 脈寬調(diào)制波pwm 返回 pwm modulate