OTN的关键技术有（)。

A.全双工

B.可变带宽子载波

C.100M及其以上大带宽

D.256QAM

A.1588v2高精度时钟同步技术

B.QoS

C.PWE3

D.端到端层次化OAM

A.世界上第三个独立掌握空间出舱关键技术的国家

B.世界上第三个掌握空间出舱关键技术的国家

C.世界上第四个掌握空间出舱关键技术的国家

D.世界上第三个有宇航员出舱活动的国家

A.虚拟化技术

B.云计算管理平台技术

C.海量数据管理技术

D.编程模型

A.sub6G+毫米波新频谱

B.数字化新运营

C.虚拟化+云化新架构

D.新空口关键技术

A.高频率

B.大带宽

C.窄带宽

D.超大规模阵列天线

The author says that in the current world, Sesame Street ______.

A．has slight edge over other shows targeting children

B．has made some changes so as to keep up with the times

C．tries to cater to adults who accompany their children to the show

D．is doomed to fail due to its out-dated content and presentation

We learn from the passage about Koch Industries that ______.

A．it signed contracts with others only on two issues

B．it believes markets can totally replace other forecasting techniques

C．its business includes goods trading, pesticide, fertilizers and chemical

D．it has applied prediction for less than a year

A.MassiveMIMO

B.Polar/LDPC编码

C.F-OFDM

D.SDN

A.1410nm左右

B.1550nm左右

C.1310nm左右

D.1710nm左右