填空题
纯净的具有晶体结构的半导体称为（），常见的半导体材料Si和Ge均为（）价元素。
本征半导体；4
单项选择题 The circuit shown here is a（）.
单项选择题 The resistor voltage and resistor current in this circuit are（）.
单项选择题 What is the value of the voltage dropped across forward-biased silicon diodes that are connected in parallel with each other？（）.
