第29题: [单项选择]SDH信号最重要的模块信号是STM-1,其速率为 A. 622.080Mbps B. 122.080Mbps C. 155.520Mbps D. 2.5Gbps 参考答案:C 答案解析:SDH即同步数字体系,最重要的模块为STM-1,其速率为155.520Mbps。
第30题: [单项选择]{{B}} Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. The woman has a choice of early flights. B. Not many planes go to Tianjin. C. The woman should take the earlier flight. D. The six o’clock flight is full. 参考答案:A 答案解析:[听力原文]
W: When is the earliest flight from Shanghai to Tianjin
M: There’s a shuttle at six and if
第31题: [多项选择]多极放大器的极间耦合形式有()三种。 A. 电感耦合 B. 二极管耦合 C. 阻容耦合 D. 变压器耦合 E. 直接耦合 参考答案:C, D, E