题目内容
（请给出正确答案）
One cell has 2 TRXs (14 timeslots used for TCH).How many Erlang can this cell carry if the QoS (blocking rate) is 2%？ （）
A.2.7 Erlang
B.8.2 Erlang
C.16.0 Erlang
D.14.0 Erlang
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A.22
B.44
C.8
D.3
E.46
A.thrill
B.cherish
C.abandon
D.deprive
cancer. originally,because of a lawsuit that alleged such a link Network news programs ran their own tests of cell phones,reporting to the public that some cell phones exceed the maximum level of emitted radio frequency energy allowed by the US Federal Communications Commission.
In 2000.it was estimated that there were 92 million cell phone users in the United States and this number was growing by 1 million every month. More recently,the Cellar Telecommunications & Internet Association estimated that there were almost 170 million US cell phone users, and the seriousness of brain tumours, this is clearly a topic of wide concern.This report summarizes what we now know about the carcinogenicity of using cell phones.
Cell phones operate with radio frequencies.a form. of energy located on the electromagnetic spectrum between F M radio waves and the waves used in microwave ovens,radar;and satellite stations.Cell phones do not emit ionizing radiation,the type that damages DNA and is known to have the ability to cause cancer.
Cell phone technology works on a system of geographically separated zones called "cells" Each cell has its own "base station" that both receives and emits radio waves.When a call is placed from a cell phone,a signal is sent from the cell phone antenna to that cell's base station antenna.The base station responds to the cell phone signal by assigning the phone an available RF channel.When the RF channel is assigned,radio signals are simultaneously received and transmitted, allowing voice information to be carried between the cell phone and the base.The base station transfers the call to a switching centre.where the call can be transferred to a local telephone carrier or another cell phone.
6.There has existed argument about the link between cell phone and brain tumour.()
7.The rapid growing number of cell phone users has been a great concern in the US.()
8.The 3rd paragraph tries to prove that cell phones do not cause brain cancer.()
9.A switching centre is needed when we make a call through cell phone.()
10.The topic of the passage is about cell phone and cancer.()
A.You have entered at least one reminder level in the purchase order item
B.The purchase order must be output
C.The delivery date is at least one week in the past
D.The purchase order item has no account assignment category
A.Increases channel utilization, cost ,and interference
B.Increases capacity and cost, but decreases interference
C.Increases capacity, but decreases cost and interference
D.Increases capacity, cost, and interference
E.Increases channel utilization and cost, but decreases interference
A.Dropped TCH connections of the total number of TCH connections
B.Dropped calls of the total number of calls terminated in the cell
C.Erlang minutes per dropped TCH connection
D.Average call drops experienced during one hour talk time
E.All of these
to each other.
1 was walking in the park with a friend recently, and his mobile phone rang, interrupting our conversation. There we were, walking and talking on a beautiful sunny day and - poof! -1 was cut off as if I had become absent from the conversation.
The park was filled with people talking on their cell phones. They were passing people without looking at them, saying hello, noticing their babies or stopping to pat their dogs. It seems that the limitless electronic voice is preferred to human contact.
The telephone is used to connect you to the absent. Now it makes people feel absent.
Recently l was in a car with three friends. The driver hushed the rest of us because he could not hear the person on the other end of his cell phone. There we were, four friends driving down the highway, unable to talk to each other because of the small thing designed to make communication easier.
Why is it that the more connected we get, the more disconnected I feel？ Every advance in communication technology is a setback(退步) to the closeness of human interaction.
With e-mail and instant message over the Internet, we can now communicate without seeing or talking to one another. With voice mail, you can make entire conversations without ever reaching anyone. If my mom has a question, Ijust leave the answer on her machine.
As almost every contact between human beings gets automatic, the emotional Distance index goes up. Pumping gas at the station？ Why say good-morning to the assistant when you can swipe you credit card at the pump and save yourself the bother of human contact？
Making a deposit at the bank？ Why talk to the clerk who lives in the neighborhood when you Ctin put your Ctird into the ATM l More and more, I find myself hiding behind e-mail to do a job meant for conversation orbeing relieved that voice mail picked up because I didn’t really have time to talk.
The technology devoted to helping me keep in touch is making me lonelier. I own a mobile phone, an ATM card, a voice-mail telephone, and an e-mail account.
Giving them up isn’t a choice. They are great for what they are intended to do. It’s their unintended results that make me upset. What good is all this gee-whiz technology if there isno one in the room to hear you crying out Gee whiz ？
26.The author’s experience of walking in a park with a friend recently made him feel ().
A.unhappy
B.funny
C.wonderful
27.According to the author, human contact in a park means ().
A.Iookmg at each other and saying hello when passing
B.noticing their babies and stopping to pat their dogs
C.both A and B
28.According to the author, the more connected we get in communication technology, the () we are.
A.more automatic
B.easier
C.more disconnected
29.What are the examples the author gives to explain his idea that every advance in communication technology is a setback to the closeness of human interaction？()
A.With e-mail and instant message over the Internet, we can now communicate without seeing or talking to one another
B.With voice mail, you can make entire conversations without ever reaching anyone
C.Both A and B
30.What is the unintended result of communication technology, according to the author？()
A.It makes communication easier and conversation possible everywhere
B.It actually creates a distance between people instead of bringing them together
C.It makes every contact between human beings automatic and makes people Feel connected
