【单选题】what time would you be home?
【简答题】What time would you like to be up?
【简答题】用户关注的通信网络主要是()传输的()性和()性问题。
【单选题】What time would you like your table?
【单选题】鉴别香豆素首选的化学显色反应是( )
C.
Borntrager反应 prefix = o ns = "urn:schemas-microsoft-com:office:office" /?
【单选题】—I’m afraid I can’t get up early. You know, winter is coming. Besides, I hate getting up early. —If I were you, I’d start from something easy, such as doing some sports once a week at first. —It sound...
B.
What time would you like to get up
C.
Could you change my mind
D.
What would you do in my situation
【多选题】下列关于SDH和WDM的说法正确的是( )。
A.
SDH 和 WDM 技术是目前传送网使用的主要技术。
B.
SDH 技术偏重于业务的电层处理,以 VC 为基本颗粒交叉调度、同步和单通道线路为基本特征。
C.
WDM 技术则专注于业务的光层处理,以多通道复用 / 解复用和长距离传输为基本特征。
D.
以 VC 调度为基础的 SDH 网络在扩展性方面呈现出了明显不足,无法满足业务的快速增长;而 WDM 技术采用客户信号直接映射进光通道的方式,使其只能定位于点对点的应用。