The phone rings. Tax official Mr. Li picks up the receiver.
电话响了，税务官员李先生拿起了电话。
The forth chapter introduces the mainboard's hardware design of tax controlled receiver. The mainboard contains common facility, such as CPU, LCD drive, FLASH, serial interface , and so on.
第四章详细介绍了税控收款机主板的硬件设计，主板包括CPU、LCD液晶驱动、FLASH、串口等常用的外设。
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