According to the passage, ______ has become the driving force for the development of telephone system?A．information technologiesB．InternetC．PCD．convergence of telecommunications technologies
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
相关考题：
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.
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
【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
If traffic problems are not solved soon，driving in this city ______ impossible. A. become B. becomes C. will become D. has become
According to the passage, the oil industry might lead northern Norway to ______.A. the development of industryB. a growth in populationC. the failure of the development programmeD. the development of new towns
According to this passage, which of the following is TRUE?___________A.Company workers started to dress down about twenty years agoB.Dress-down has become an everyday phenomenon since the early 1990sC."Dress-down Friday" was first given as a favor from employersD.Many workers want to wear casual clothes to impress people
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
单选题According to the passage, all of these are true EXCEPT ______.APurple loosestrife propagates through an underground system.BPurple loosestrife has even affected the survival of fish.CPurple loosestrife is best eradicated through controlled burning.DPurple loosestrife is sometimes found in urban areas.EPurple loosestrife is found in the wetlands of most states.
单选题According to the passage, the Concordia´s captain has been charged with causing the crash and______.Adrug useBalcohol abuseCabandoning his postDsetting fire
单选题According to the passage, which of the following statements is TRUE?ABuy Nothing Day has become popular in the United States.BRestaurants have a tradition of donating food on holidays.CGirl shops are expected to be closed on Buy Nothing Day.DChildren like the idea of Buy Nothing Day best.
单选题According to the passage, the unemployment rate has been kept under limits because _____.Athe number of the people in the work force slowly increasesBvery few people really lose their original jobsCless and less people are out finding new jobsDthe government has taken strong measures to control the unemployment rate
单选题According to the passage, which of the following has changed the most in the last 500 years?AFoodBChocolate drinksCPotatoDCoffee
单选题It is mentioned in the passage that one has to pay tax according to _____.Ahow much education one has receivedBwhether one is single or marriedChow old one’s children areDwhere one lives
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.
单选题According to the passage, the Concordia’s captain has been charged with causing the crash andAdrug useBalcohol abuseCabandoning his postDsetting fire
单选题According to the passage, as the Sun continues to age, what color is it likely to become?AYellow.BViolet.CRed.DWhite.
单选题CT Telecommunications offers telephone customers the ______ selection of cellular phones available in the city.AwiderBwidestCmore widelyDmost widely
单选题According to the passage people who have experienced ups and downs may become _____.Anervous when faced with difficultiesBphysically and mentally strainedCmore capable of Coping with adversityDindifferent, toward what happens to them
单选题According to this passage, which of the following statements is TRUE?ACompany workers started to dress down about twenty years ago.BDress-down has become an everyday phenomenon since the early 1990s.C“Dress-down Friday” was first given as a favor from employers.DMany workers want to wear casual clothes to impress people.
单选题According to Excerpt 6, in the future_____.Ait may be hard to predict the development of the InternetBthe Internet will become an indispensable superhighwayCthe Internet will be applied moreDthe Internet will combine cable stations
单选题According to the passage, which of the following statements is true?ATransporting goods and people is the most important technology in the history of mankind.BTechnology in transporting goods and people has changed human conditions more than anything else.CTechnology in spreading information has changed human conditions more than transportation technology.DTechnology in spreading information can’t change the economic development of society.
单选题According to the passage, driving can be safe if ______.Ayou are patientByou obey all the traffic rulesCyou don’t cut another car offDyou wait in line at a red light
单选题Which of the following situations is most dangerous according to the passage?AAdults giving a lift to teenagers on the highway after 10 p.m.BA teenager driving after midnight with passengers in the car.CAdults driving with three or more teenage passengers late at night.DA teenager getting a lift from a stranger on the highway at midnight.
单选题According to the passage, which of the following is true of the last hundred years?AFossil fuels were burned for the first time.BGreater amounts of land were cleared than at any time before.CThe average temperature at the Earth’s surface has become 2℃ cooler.DThe amount of carbon dioxide in the atmosphere has increased measurably.
单选题When an ICMP redirect is received， which of the following options is the most appropriate to conclude？（）AA routing table has changedBThe IP address has changedCThe system has become a gatewayDA hacker is posing a threat to the system
单选题According to the passage, which of the following has changed the most in the last 500 years?AFood.BChocolate.CPotatoDCoffee.
单选题According to the passage, which of the following can be concluded form the passage about this couple?AThey will live happily ever after.BTheir marriage is not harmonious.CThe couple will adopt children.DThey will become schoolteachers.