【单选题】速率155.520Mbit/s是( )系统的标准速率等级之一。
【单选题】欲除去氯气中少量的氯化氢气体,可选用的试剂是( )
【简答题】STM-1的速率是_______Mbit/s。
【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】欲除去氯气中少量的氯化氢气体,可选用的试剂是
【单选题】SDH 是同步复用的 , STM-1 的速率是 155Mbit/s , 其他速率以 ( ) 为倍数递增。
【单选题】欲除去氯气中少量的氯化氢气体,可选用的试剂是