Diodes allow electricity to flow either one direction.
查看答案
Diodes also are called valves.
A. 对
B. 错
The symbol of NPN and PNP transistors is same.
A. 对
B. 错
ICs are complex circuits which have been etched onto tiny chips of semiconductor.
A. 对
B. 错
LED is one type of diodes.
A. 对
B. 错
微信支付 
支付宝支付