Only one input of the digital circuit unit is the buffer or inverter, the input in more than one are called logic gates.
只有一个输入的数字电路单元是缓冲器或反相器，而输入在一个以上的则称为逻辑门。
2
As the original image input of the digital copier, the scanning and imaging unit plays a very important role in the digital copier.
作为数码复印机的原稿图像输入端，扫描成像单元在数码复印机中起着至关重要的作用。
3
The control system is composed of setting unit(host computer ), digital controller , input channel (position detector)and output channel (actuating mechanism).