题目内容：
下列关于晶体管的描述正确的是（）Ⅰ.由微电路元件构成，包括线缆，三极管，电阻，电容等，封装在一个薄的硅片上。Ⅱ.用于替换计算机系统中的真空管。
A.Ⅰ
B.None
C.Ⅱ
D.Ⅰ、Ⅱ
参考答案：
选择题：下列关于晶体管的描述正确的是（）Ⅰ.由微电路元件构成，包括线缆，三极管，电阻，电容等，封装在一个薄的硅片上。Ⅱ.用于替换
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