【单选题】速率155.520Mbit/s是( )系统的标准速率等级之一。
【判断题】STM-1的正常速率是51.840Mbit/s。
【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.
【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
【单选题】欲除去氯气中少量的氯化氢气体,可选用的试剂是
【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 ________。
【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.