题目内容

The Old Town of Lijiang is rather a modern town.

A. 对
B. 错

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The Old Town is located in northwestern Yunnan Province.

A. 对
B. 错

The Old town is a World Cultural Heritage Site.

A. 对
B. 错

晶体管工作在放大区时,其特点是()。

A. 发射结正偏,集电结反偏
B. 发射结反偏,集电结正偏
C. 发射结正偏,集电结正偏
D. 发射结反偏,集电结反偏

测得某放大电路中晶体管三个管脚对地电压分别为U1=2V,U2=6V,U3=2.7V,则三个电极为()。

A. ①管脚为发射极②管脚为基极③管脚为集电极
B. ①管脚为发射极②管脚为集电极③管脚为基极
C. ①管脚为集电极②管脚为基极③管脚为发射极
D. ①管脚为基极②管脚为发射极③管脚为集电极

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