晶体三极管的三种基本电路是()、()、()。
参考答案:共基极电路、共发射极电路、共集电极电路
_________ around the Water Cube,we were then taken to see the Bird’s Nest for the 2008 Olympic Games.
A.Having shown
B.To be shown
C.Having been shown
D.To show
微光夜视仪工作于被动方式,本身不携带光源,靠接收目标反射的夜天光工作。