大学MOOC 通信专业英语(南京工业职业技术大学)1002460002 最新慕课完整章节测试答案
专业英语基础知识
专业英语基础知识单元测试
1、单选题：
A continuous signal is also called because its waveform is often analogous to that of the physical variable.
选项：
A: an analog signal
B: a discrete signal
C: a digital signal
D: a sampled signal
答案: 【 an analog signal】
2、单选题：
A system is called linear if it has two mathematical properties: .
选项：
A: continuous and shift-invariance
B: shift-invariance and homogeneity
C: additivity and homogeneity
D: additivity and shift-invariance
答案: 【 additivity and homogeneity】
3、单选题：
Basic circuit theory can be used at .
选项：
A: FR/microwave frequency
B: the optical field
C: lower frequency
D: any frequency
答案: 【 lower frequency】
4、单选题：
In the analysis and design of communication systems, ______ is particularly important.
选项：
A: the characteristics of the physical channels
B: the source output
C: the binary information sequence
D: the amount of redundancy introduced
答案: 【 the characteristics of the physical channels】
5、单选题：
In order to form a cluster in a cellular network, cells are generally organized in groups of ______
选项：
A: Six
B: seven
C: five
D: eight
答案: 【 seven】
6、单选题：
The idea, originated with Bell, of using glass fiber to carry an opticalcommunication signal had to wait some 80 years to be useful because ______.
选项：
A: people were not interested in this idea
B: nobody sponsored this project
C: didn't have suitable glass and low-cost electronics for it
D: other reasons
答案: 【 didn't have suitable glass and low-cost electronics for it】
项目一 通信技术基础
通信技术基础单元测试
1、单选题：
A continuous signal is also called because its waveform is often analogous to that of the physical variable.
选项：
A: an analog signal
B: a discrete signal
C: a digital signal
D: a sampled signal
答案: 【 an analog signal】
2、单选题：
A system is called linear if it has two mathematical properties: .
选项：
A: continuous and shift-invariance
B: shift-invariance and homogeneity
C: additivity and homogeneity
D: additivity and shift-invariance
答案: 【 additivity and homogeneity】
3、单选题：
The unit impulse signal is the unit step signal.
选项：
A: the same as
B: the differential of
C: the integral of
D: the cumulative sum of
答案: 【 the differential of】
4、单选题：
Which of the following statements best describes the property of the system T if y1(t)=T[x1(t)], y2(t)= T[x2(t)] implies T[ax1(t-s)+bx2(t-s)]= ay1(t-s)+by2(t-s), .
选项：
A: the system is linear
B: it is a linear time-invariant system
C: the system satisfies the principle of superposition
D: the system satisfies additivity and time-invariance
答案: 【 it is a linear time-invariant system】
5、单选题：
Any signal can be represented as .
选项：
A: the sum of a series of sinusoids with the same amplitudes
B: the sum of a series of sinusoids at the same frequencies
C: the sum of a series of shifted and scaled unit step function
D: the sum of a series of shifted and scaled unit impulse function
答案: 【 the sum of a series of shifted and scaled unit impulse function】
6、单选题：
The beginning of microwave engineering is characterized by
选项：
A: a piece of paper written by Oliver Heaviside
B: The discovery that electromagnetic wave propagation was possible in waveguide
C: The experimental demonstration of the propagation of electromagnetic waves
D: Maxwell's equations
答案: 【 Maxwell's equations】
7、单选题：
showed experimentally the possibility of electromagnetic wave propagation in waveguide?
选项：
A: Heinrich Hertz
B: George Southworth and W.L.Barron
C: Oliver Heaviside
D: Lord Rayleigh
答案: 【 George Southworth and W.L.Barron】
8、单选题：
Basic circuit theory can be used at .
选项：
A: FR/microwave frequency
B: the optical field
C: lower frequency
D: any frequency
答案: 【 lower frequency】
9、单选题：
Which is not considered as the advantage to using RF/microwaves?̴