6．若10位A／D芯片工作于±10V，当采样结果为0100000000，输入电压Ui为

A．5V                                                                 B．2.5V

C．1.25V                                                             D．0.625V

7．抗腐性好的通信系统是

A．载波通信                                                        B．光纤通信

C．架空线                                                           D．电缆线

8．异步通信特点之一是

A．传输效率高                                                    B．时钟要求高

C．设备简单                                                        D．设备复杂

9．霍尔模块的过载能力可达

A．10倍                                                              B．15倍

C．20倍                                                              D．30倍

10．地区电网调度中心职责之一是调整

A．电流                                                               B．电压

C．有功                                                               D．频率