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【单选题】
开放系统互连参考模型OSI中,实现把传输的比特流划分为帧这一功能的是___________。A.
数据链路层
B.
网络层
C.
传输层
D.
会话层
手机使用
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举一反三
【单选题】A key feature of quantum information science is the understanding that groups of two or more quantum objects can have states that are entangled, such that the members of an entangled collection of obj...
A.
indignation
B.
impatience
C.
disbelief
D.
indifference
E.
defiance
【单选题】We can infer that the key feature of Ningbo campus of Nottingham University is that______.
A.
it has a western style. campus
B.
it charges half the price of Nottingham University
C.
it provides similar education as in Nottingham
D.
it is a joint venture with a Chinese enterprise
【单选题】对QAM，下列哪种说法是错误的？
A.
QAM就是对载波的振幅和相位同时进行调制的一种方式 ；
B.
QAM 是 正交幅度调制 ；
C.
幅相键控（ APK）方式 就是 QAM ；
D.
幅相键控（ APK）方式 与 QAM 在原理上不同。
【单选题】The key feature of ballad is ______.
A.
quick rhythm
B.
slow rhythm
C.
rhymed lyrics
D.
content of love story
【单选题】The key feature of the Sulzer RT-flex system is that it gives complete freedom in the and operation of fuel injection and exhaust valve actuation.
A.
metering
B.
control
C.
using
D.
timing
【简答题】ADSL 通常采用的三种基本调制技术是 QAM 、 ( ) 和 CAP 。
【简答题】什么是QAM?
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