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, occupyingC. 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, locateC. 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, choosingC. 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, whenC. 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 identifyC. specified, identifiedD. 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 callC. been，call D. to be，called( )8.This interface is so called because the _________data and the _________data...
