![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
The gain of switch-mode linear amplifier is determined by () voltage, and the output voltage is a linear function of ()
A.
the output dc, the control voltage
B.
the input dc source , the control voltage
C.
the input dc source, the output voltage
D.
the input ac source, the control voltage