射极输出器又称为电压跟随器，是因为其电压放大倍数等于1 ，输出电压与输入电压相同。
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放大电路输出信号的能量来自交流电源。
A. 对
B. 错
Decide whether the following statements are true (A) or false (B).At the entrance to the town, the tour guide tells the tourists the meeting time.
A. 对
B. 错
The Old Town of Lijiang is rather a modern town.
A. 对
B. 错
The Old Town is located in northwestern Yunnan Province.
A. 对
B. 错
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