高级通信工程师考试复习题

通信英语强化训练试题（一）

Ⅰ 单项选择题：(Choose the best one)

( )1. Furthermore, we shall prove that a minimum theoretical sampling

frequency of order 6. 8 kHz is required _________a voice channel

_________the range 300Hz to 3. 4 kHz.

A. convey, occupy B. to convey, occupying

C. conveying, occupied D. convey, to occupy

( )2. For example, the signal _________from a satellite, _________in

far outer space, is very weak.

A. received, located B. receive, locate

C. receiving, locating D. to receive, to locate

( )3. If we consider binary transmission, the complete information

about a particular message will always _________by simply

_________the presence or absence of the pulse.

A. obtain, detect B. be obtained, detecting

C. obtained, detected D. obtaining, detected

( )4. 4. There is an inherent advantage for _________noisy

environments by _________digital transmission.

A. overcoming, choose B. overcome, choosing

C. overcome, choose D. overcoming, choosing

( )5. Each voice channel has a separate coder，the unit

_________converts sampled amplitude values to a set of pulses;

And decoder, the unit _________performs the reverse operation. A. who, who B. when, when

C. where, where D. that, that

( )6. The problem is easily overcome by _________a frame format,

where at the start of each frame a unique sequence of pulses

is placed _________the start of the frame.

A. specify, identify B. specifying, so as to

identify

C. specified, identified D. specify, identifying

( )7. An asynchronous serial data link is said _________character

oriented，as information is transmitted in the form of groups

of bits _________characters.

A. be，calling B. to being，to call

C. been，call D. to be，called

( )8. This interface is so called because the _________data and the

_________data are not synchronized over any extended period.

A. transmit，receive B. to transmit，to receive

C. transmitting，receiving D. transmitted，received

( )9. Serial data transmission systems _________in the telephone，Morse code, and even the smoke signals once _________by native

Americans.

A. are finding，using B. are found，used

C. find, use D. be found, using

( )10. Traditionally，the idle state _________the mark level. By convention this corresponds _________a logical 1 level.

A. is referred to, as B. is referred as, in

C, is referred to as, to D. is referred，within

( )11. The transmitter then sends the character，1 bit at a time，by _________each successive bit on the line for a duration of

T seconds, _________all bits have been transmitted.

A. place, still B. placed，since

C. placing, until D. placing，because

( )12. When the data link connects a CRT terminal _________a computer，_________problems arise, as the terminal is itself character

oriented.

A. into, many B. on，a few

C. in, a few D. to，few

( )13. _________the receiving end of a synchronous serial data link，the receiver continually monitors the line _________a start

bit.

A. On，looking B. Within，look for

C. In, look at D. At，looking for

( )14. As companies realized they could save money and gain

productivity by _________networking technology, they added

networks and expanded _________networks almost as rapidly as

new network technologies and products could be introduced.

A. use, exist B. using, existing C. to use, to exist D. used, existed

( )15. The OSI reference model allows you _________the network

functions that occur at each layer. More importantly, the OSI

reference model is a framework you can use _________how

information travels throughout a network.

A. view, understand B. viewing, understanding

C. viewed, understood D. to view, to understand

( )16. The transport layer segments data from the _________host’s

system and reassembles the data into a data stream on the

_________host’s system.

A. sending, receiving B. to send, to receive

C. sent, received D. send, receive

( )17. The data link layer provides the transit of data _________a

physical link. In so doing, the data link layer is concerned

_________physical addressing, network topology, network media

access, and error detection.

A. with, across B. at, in

C. between, in D. across, with

Ⅱ 短语英译汉：(Translate the following phrases into Chinese)

1. the schemes for performing these three functions

2. a series of amplitude values