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[单选题]

SMS can transmit in which logical channel of the following:（）.

A.BCCH

B.SDCCH

C.TCH

D.FACH

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发布时间：2022-05-23

更多“SMS can transmit in which logical channel of the following:（）.”相关的问题

第1题

Reporters can transmit images either through the Internet or through their mobile phon

A.记者通过或联网或者移动电话来发射形象信号

B.报道人员要么通过互联网，要么通过移动电话来传输形象

C.记者既可以通过互联网，也可以通过移动电话传送图像信息

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第2题

With a tremendous roar from its rocket engine, the satellite is sent up into the sky. Minu

tes later, at an altitude of 300 miles, this tiny electronic moon begins to orbit about the earth. Its radio begins to transmit a staggering amount of information about the satellite's orbital path, the amount of radiation it detects, and the presence of meteorites. Information of all kinds races back to the earth. No human being could possibly copy down all these facts, much less remember and organize them. But an electronic computer can.

The marvel of the machine age, the electronic computer has been in use only since 1946. It can do simple computations—add, subtract, multiply, and divide—with lightning speed and perfect accuracy. It can multiply two 10-digit numbers in 1/1, 000 second, a problem that would take an average person five minutes to do with pencil and paper. Some computers can work 500, 000 times faster than any person can.

Once it is given a program, that is, a carefully worked-out set of instructions devised by a technician trained in computer language, a computer can gather a wide range of information for many purposes. For the scientist it can get information from outer space or from the depths of the ocean. In business and industry the computer prepares factory inventories, keeps track of sales trends and production needs, mails dividend checks, and makes out company payrolls. It can keep bank accounts up to date and make out electric bills. If you are planning a trip by plane, the computer will find out what route to take and what space is available.

Why does the author regard the electronic computer as the marvel of the machine age？

A．Because electronic computers are rare.

B．Because people know little about electronic computers.

C．Because electronic computers can do much more kinds of work that human beings can't.

D．Because electronic computers have been widely suspected.

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第3题

Many of the most damaging and life threatening types of weather, such as torrential rains

and severe thunderstorms, begin quickly, strike suddenly, and disappear rapidly, destroying small regions while leaving neighboring areas untouched. Conventional (普通) computer models of the atmosphere have limited value in predicting short-lived local storms because the available weather data are generally not detailed enough to allow computers to see clearly the small atmospheric changes that come before these storms. In most nations, for example, weather-balloon observations are taken just once every twelve hours at location typically separated by hundreds of miles. With such limited data, conventional forecasting models do a much better job predicting general weather conditions over large regions than they do forecasting specific local events.

Until recently, the observation-intensive approach needed for accurate, very short range forecasts, or "nowcasts" , was impracticable. The cost of equipping and operating many thousands of conventional weather stations was extremely high, and the difficulties involved in rapidly collecting and processing the raw weather data from such a network were beyond overcoming. Fortunately, scientific and technological advance have overcome most of these problems. Radar systems, automated weather instruments , and satellites are all capable of making detailed, nearly continuous observations over large regions at a relatively low cost. Communication satellites can transmit data around the world cheaply and immediately, and modern computers can quickly compile and analyze this large volume of weather information. Meteorologists (气象学家) and computer scientists now work together to design computer programs and video equipment capable of transforming raw weather data into words, symbols, and vivid graphic displays that forecasters can interpret easily and quickly. As meteorologists have begun using these new technologies in weather forecasting offices, nowcasting is becoming a reality.

What is the best title of the passage？

A．Severe Thunderstorms and Damages

B．Weather Forecasting and Life-threatening

C．Science Advances and Nowcasts

D．Available Data and Nowcasts

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第4题

A．transformB．transmitC．transferD．transport

A.transform

B.transmit

C.transfer

D.transport

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第5题

It seems to shine unchangingly, pouring out a constant light year after year. But the sun

may not be nearly so stable as we suppose. It is now thought to move quickly and irregularly and change in long-term cycles, growing dimmer and then brighter with each passing year. Some even fear that its frequent changing behavior. would have a great influence on the Earth' s climate.

The source of the sun' s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.

"We don' t yet know what causes sun spots, "he says, "but we now think they ' re areas of high level magnetism that come up from the sun' s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. "As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.

Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.

Could such a small drop in energy have an effect here on earth？ Perhaps some scientists think the world temperature could fall by' as much as 0.2 during periods of high solar magnetism.., enough to cause significant fluctuations in weather patterns.

According to the passage, it is believed that the sun ______ ．

A．moves in a quick but steady way year after year

B．sends out less and less heat and light with each passing year

C．radiates the same amount of light every year

D．might have a strong influence on the weather patterns

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第6题

MS在通话过程中能否接受SMS，下列说法正确的是（)。A.不能同时接收SMS，中心发出的SMS将丢失B.不能同

MS在通话过程中能否接受SMS，下列说法正确的是()。

A.不能同时接收SMS，中心发出的SMS将丢失

B.不能同时接收SMS，但通话结束后仍然可以收到

C.能同时接收SMS，只能用SACCH来接收