题目
A.are the most three common means
B.are the most common three means
C.are the three most common means
D.are three the most common means
第1题
The telephone, clock, and radio are ______ located by the patient’s bedside.
Ahandily
Bskillfully
Creadily
Dquickly
第3题
The best title for this passage is______.
A. Australian Families
B. Australian Pe0ple
C. A Useful Radio
D. A Telephone Call
第4题
Which radio equipment is not necessary for the ships sailing in the sea area A2?
A.MF DSC
B.VHF radio telephone
C.VHF DSC
D.VHF EPIRB
第6题
Which of the following is NOT TRUE in the passage?
A. The two-way radio is like a telephone for Australian farmers.
B. Families on large farms could keep in touch with each other by radios.
C. The two-way radio is like a newspaper for Australian farmers.
D. All the Australians live on dry places, and they use radios in many ways.
第7题
A.a portable radio
B.in instrument to make his voice louder.
C.a long stick
D.a telephone in his car
第8题
A.distress position
B.spoken words “Mayday, Mayday, Mayday”
C.ship’s name
D.ship’s call letters
第9题
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 abo
A.Current development.
B.Transmission of message.
C.Computer networking.
D.Government regulation.
第10题
Passage Five
Australia is nearly as large as the United States, but most of it is too dry for people to live in. Around
this dry part are large sheep and cow farms. A few of them are as large as the smallest states: of America.
Often the nearest neighbours are several hundred kilometers away.
The two-way radio is very important to people who live on these great Australian farms. It works much like a
telephone. A person can listen to someone else talk and then gives an answer. For example, people on
the large farms could talk to a doctor far away. They could tell the doctor about someone who was ill,
and the doctor could let them know how to look after the sick person.
As the large farms were so far from towns, the children could not go to school. Radio schools were
started for them in some places. At a certain time each day, boys and girls turn on their radios and
listen to teachers in cities far away.
Families on the large farms wanted to give news to their neighbours. The programme Round Robin
Talks by radio was started to keep families in touch with each other. They could talk about who was
going away and who was iii. The men could talk about their sheep and cows and how much money
the markets would pay for them. In many ways the radio became a newspaper for the farm people of Australia.
52. In the passage "the two-way radio" is______.
A. important to Americans
B. useful for children only
C. used as a telephone
D. only used by doctors
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