6．若10位A／D芯片工作于±10V，當(dāng)采樣結(jié)果為0100000000，輸入電壓Ui為

A．5V                                                                 B．2.5V

C．1.25V                                                             D．0.625V

7．抗腐性好的通信系統(tǒng)是

A．載波通信                                                        B．光纖通信

C．架空線                                                           D．電纜線

8．異步通信特點(diǎn)之一是

A．傳輸效率高                                                    B．時(shí)鐘要求高

C．設(shè)備簡單                                                        D．設(shè)備復(fù)雜

9．霍爾模塊的過載能力可達(dá)

A．10倍                                                              B．15倍

C．20倍                                                              D．30倍

10．地區(qū)電網(wǎng)調(diào)度中心職責(zé)之一是調(diào)整

A．電流                                                               B．電壓

C．有功                                                               D．頻率