放大倍数是表示放大器的放大能力,一般要求越大越好。
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输出电阻是表明放大电路带负载的能力，Ro越小，放大电路带负载的能力，反之则差。
一般来说，对于输入信号源为电压源的放大电路，其输入电阻 Ri应。
输入电阻是从放大电路输入端看进去的等效电阻，即放大器是信号源的一个。
What is Alice's future hope?
A. She wants to be a teacher in China.
B. She wants to travel and see the world.
C. She wants to teach Chinese in the U.K.
D. She wants to study in a teacher training college.
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