4、这缓冲器(bufr)能提供4mA的输出驱动电 流 5、我们借助于电场( electric field)这一概念描述 电荷之间的相互作用。 6、现在必须从式(4-10)求出t来 4 This buffer can supply an output drive current of 4 mA 5, We describe interaction among charges with the help of the concept of electric field. 6 Now it is necessary to solve equation (4-10)for t.4、这缓冲器（buffer）能提供4mA的输出驱动电 流。 5、我们借助于电场（electric field）这一概念描述 电荷之间的相互作用。 6、现在必须从式（4－10）求出t来。 4、This buffer can supply an output drive current of 4 mA. 5、We describe interaction among charges with the help of the concept of electric field. 6、Now it is necessary to solve equation (4-10) for t