单项选择题

反向比例放大电路中，同相输入端的输入电阻应如何选？
A、远远大于反相端输入电阻；
B、接近反相端输入电阻；
C、远远小于反相端输入电阻；

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A．efferent lymphatic vessels
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C．hilum
D．cortical sinuses
E．afferent lymphatic vessels

单项选择题

The Wild Elephant Valley there is a famous nature reserve for ______.

A．endangered Asian elephants
B．endangered plants
C．precious animals
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