【单选题】速率155.520Mbit/s是( )系统的标准速率等级之一。
【单选题】STM_1的速率是 Mbit/s,STM_16的速率是STM_1的 倍。()
【单选题】----Don't forget to ask him to write to me. ----I won't. As soon as he ____, I'll ask him to write to you.
【单选题】--- Don’t forget to ask him to write to me. --- I won’t. As soon as he __ ______ _____, I’ll ask him to write to you. A. will come B. came C. comes D. is coming
【判断题】SDH的基本速率是155.52Mbit/s,称为STM-1,更高的速率是STM-1的N倍,表示为STM-N。
【单选题】SDH最基本的模块信号是STM-1,它的速率是155Mbit/s,STM-16的速率是 ________。
【简答题】阅读理解。 When you go to see a doctor, he will write you a note (处方) to take to the chemist for some medicine. Chemists are usually good at reading doctors' notes.But sometimes doctors write too badly and...
【单选题】— Don’t forget to ask him to write to me. —I won’t. As soon as he _______, I’ll ask him to write to you.