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According to the passage, ______ has become the driving force for the development of telephone system?
A．information technologies
B．Internet
C．PC
D．convergence of telecommunications technologies
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更多 “ According to the passage, ______ has become the driving force for the development of telephone system?A．information technologiesB．InternetC．PCD．convergence of telecommunications technologies ” 相关考题
考题
Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information aboA．Current development.B．Transmission of message.C．Computer networking.D．Government regulation.
考题
Packet switching is a method of slicing(71) messages into parcels called "packets," sending the packets along different communication(72) as they become available, and then reassembling the packets(73) they arrive at their destination. Prior to the development of packet switching, early computer networks used leased, dedicated telephone circuits to(74) with terminals and other computers. In circuit-switched networks such as the telephone system, a complete point-to-point(75) is put together, and then communication can proceed.A．binaryB．usefulC．digitalD．analog
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【With the 4G telecommunications systems now starting to be deployed,people are looking towards the development of 5th generation or 5G technology services.Although the deployment of any wireless or cellular system take years,development of the 5G technology systems is being investigated.The new 5G technologies will need to be chosen developed and perfected to enable timely and reliable deployment. The new 5th generation,5G technology for cellular systems will probably start to come to fruition around 2020. The current status of the 5G technology for cellular systems is very much in the early development stages.Many companies are looking into the technologies that could be used to become part of the system.In addition to this,a number of universities have set up 5G research units focused on developing the technologies for 5G. In addition, the standards bodies,particularly 3GPP are aware of the development but are not actively planing the 5G systems yet.Many of the technologies to be used for 5G will start to appear in the systems used for 4G and then as the new 5G cellular system starts to formulate in a more concrete manner,they will be incorporated into the new 5G cellular system. The major issue with 5G technology is that there is such an enormously wide variation in the requirements:super fast downloads to small data requirements for IoT than any one system will not be able to meet these needs.Accordingly a layer approach is likely to be adopted.As one commentator stated:5G is not just a mobile technology.It is ubiquitous access to high low data rate services.】 Based on the paragraph above,at present,5G technology for cellular systems （ ）, many of the technologies to be used for 5G （ ） in the systems used for 4G,the major issue facing with 5G technology is （ ）.A．has matured B．has setup its standards C．is very much in the early development stages D．is in use A．is being developed B．already appeared C．will not appear D．will start to appear A．super fast downloads B．small data requirements for IoT C．4G system has already satisfied these needs D．an enormously wide variation in the requirements
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If traffic problems are not solved soon，driving in this city ______ impossible. A. become B. becomes C. will become D. has become
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According to the passage, the oil industry might lead northern Norway to ______.A. the development of industry
B. a growth in population
C. the failure of the development programme
D. the development of new towns
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According to this passage, which of the following is TRUE?___________A.Company workers started to dress down about twenty years ago
B.Dress-down has become an everyday phenomenon since the early 1990s
C."Dress-down Friday" was first given as a favor from employers
D.Many workers want to wear casual clothes to impress people
考题
When an ICMP redirect is received， which of the following options is the most appropriate to conclude？（）A、A routing table has changedB、The IP address has changedC、The system has become a gatewayD、A hacker is posing a threat to the system
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单选题According to the passage, all of these are true EXCEPT ______.A
Purple loosestrife propagates through an underground system.B
Purple loosestrife has even affected the survival of fish.C
Purple loosestrife is best eradicated through controlled burning.D
Purple loosestrife is sometimes found in urban areas.E
Purple loosestrife is found in the wetlands of most states.
考题
单选题According to the passage, the Concordia´s captain has been charged with causing the crash and______.A
drug useB
alcohol abuseC
abandoning his postD
setting fire
考题
单选题According to the passage, which of the following statements is TRUE?A
Buy Nothing Day has become popular in the United States.B
Restaurants have a tradition of donating food on holidays.C
Girl shops are expected to be closed on Buy Nothing Day.D
Children like the idea of Buy Nothing Day best.
考题
单选题According to the passage, the unemployment rate has been kept under limits because _____.A
the number of the people in the work force slowly increasesB
very few people really lose their original jobsC
less and less people are out finding new jobsD
the government has taken strong measures to control the unemployment rate
考题
单选题According to the passage, which of the following has changed the most in the last 500 years?A
FoodB
Chocolate drinksC
PotatoD
Coffee
考题
单选题It is mentioned in the passage that one has to pay tax according to _____.A
how much education one has receivedB
whether one is single or marriedC
how old one’s children areD
where one lives
考题
问答题Practice 2 The miracle silicon chip represents a development in the technology of mankind that over the past few years has acquired the force and significance associated with the development of hand tools or the discovery of the steam engine. Just as the Industrial Revolution took over an immense range of tasks from men’ s muscles and enormously expanded productivity, so the microcomputer is rapidly assuming huge burdens of tedious work from the human brain and thereby expanding the mind’s capacities in ways that man has only begun to grasp. With the chip, remarkable achievements of memory and execution become possible in everything from farms to banks to corporate offices.
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单选题According to the passage, the Concordia’s captain has been charged with causing the crash andA
drug useB
alcohol abuseC
abandoning his postD
setting fire
考题
单选题According to the passage, as the Sun continues to age, what color is it likely to become?A
Yellow.B
Violet.C
Red.D
White.
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单选题CT Telecommunications offers telephone customers the ______ selection of cellular phones available in the city.A
widerB
widestC
more widelyD
most widely
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单选题According to the passage people who have experienced ups and downs may become _____.A
nervous when faced with difficultiesB
physically and mentally strainedC
more capable of Coping with adversityD
indifferent, toward what happens to them
考题
单选题According to this passage, which of the following statements is TRUE?A
Company workers started to dress down about twenty years ago.B
Dress-down has become an everyday phenomenon since the early 1990s.C
“Dress-down Friday” was first given as a favor from employers.D
Many workers want to wear casual clothes to impress people.
考题
单选题According to Excerpt 6, in the future_____.A
it may be hard to predict the development of the InternetB
the Internet will become an indispensable superhighwayC
the Internet will be applied moreD
the Internet will combine cable stations
考题
单选题According to the passage, which of the following statements is true?A
Transporting goods and people is the most important technology in the history of mankind.B
Technology in transporting goods and people has changed human conditions more than anything else.C
Technology in spreading information has changed human conditions more than transportation technology.D
Technology in spreading information can’t change the economic development of society.
考题
单选题According to the passage, driving can be safe if ______.A
you are patientB
you obey all the traffic rulesC
you don’t cut another car offD
you wait in line at a red light
考题
单选题Which of the following situations is most dangerous according to the passage?A
Adults giving a lift to teenagers on the highway after 10 p.m.B
A teenager driving after midnight with passengers in the car.C
Adults driving with three or more teenage passengers late at night.D
A teenager getting a lift from a stranger on the highway at midnight.
考题
单选题According to the passage, which of the following is true of the last hundred years?A
Fossil fuels were burned for the first time.B
Greater amounts of land were cleared than at any time before.C
The average temperature at the Earth’s surface has become 2℃ cooler.D
The amount of carbon dioxide in the atmosphere has increased measurably.
考题
单选题When an ICMP redirect is received， which of the following options is the most appropriate to conclude？（）A
A routing table has changedB
The IP address has changedC
The system has become a gatewayD
A hacker is posing a threat to the system
考题
单选题According to the passage, which of the following has changed the most in the last 500 years?A
Food.B
Chocolate.C
PotatoD
Coffee.
考题
单选题According to the passage, which of the following can be concluded form the passage about this couple?A
They will live happily ever after.B
Their marriage is not harmonious.C
The couple will adopt children.D
They will become schoolteachers.
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