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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone agai...
A.
disastrous.
B.
unpredictable.
C.
exciting.
D.
colourful.
【单选题】Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone agai...
A.
disastrous.
B.
unpredictable.
C.
exciting.
D.
colourful.
相关题目：
【判断题】常温下硅晶体三极管的U错误E=约为0.7V，且随温度升高而减小。( )
A.
正确
B.
错误
【判断题】硅晶体结构中原子间结合方式属于离子键
A.
正确
B.
错误
【单选题】相同容量的异步电机和变压器相比，前者的空载电流比后者小。（ ）
A.
正确
B.
错误
【单选题】硅晶体结构是金刚石结构，每个晶胞中含原子个数为（ ）
A.
1
B.
2
C.
4
D.
8
【判断题】硅晶体的半导体性源于共价键。()
A.
正确
B.
错误
【判断题】1A电流比-1A电流大
A.
正确
B.
错误
【单选题】Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone agai...
A.
disastrous.
B.
unpredictable.
C.
exciting.
D.
colourful.
【单选题】Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone agai...
A.
disastrous.
B.
unpredictable.
C.
exciting.
D.
colourful.
【判断题】硅晶体管和锗晶体管都有PNP和NPN型两种类型。
A.
正确
B.
错误
【判断题】成年男性的摆脱电流比成年女性的大。
A.
正确
B.
错误
【单选题】锗晶体管的导通压降约|UBE|为
A.
0.1V
B.
0.3V
C.
0.5V
D.
0.2V