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[单选题]

A cell has three TRUs with an SDCCH／8 configuration. What is the maximum number of tel

A.22

B.44

C.8

D.3

E.46

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发布时间：2022-05-30

更多“A cell has three TRUs with an SDCCH／8 configuration. What is the maximum number of tel”相关的问题

第1题

AT&T plans to spend 18 billion dollars in 2010【D1】______ its wireless networks to 【D2】

______the increasing amount of new traffic. This is roughly $2 billion more than the company had 【D3】______ in the previous year. Specifically, AT&T will add 2, 000 new cell sites and upgrade existing cell sites with three times more fiber links than it had in 2009. This will increase【D4】______ to connect the cell towers to AT&Ts main network. AT&T, which is the only wireless【D5】______ in the US selling the iPhone, has been the【D6】______of much criticism over this past year, as many iPhone 【D7】______, particularly in densely populated urban areas, have【D8】______ about dropped calls, slow Internet access, and poor service. Some critics claim the company has not been spending enough on network upgrades to【D9】______ with growing demand. AT&T has【D10】______ that it has faced some difficulties, particularly in big cities. But the company is "closing the gap".

【D1】

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第2题

听力原文：As you know, Wellington Corporation is a global company so we sell our products a

ll over the world. Our best-selling international product is our headphones. We do sell a lot of calculators, stereos, and cell phones, but our headphones really are the star product. Currently, we have sales in thirty-six countries, but we hope to increase that to fifty during the next three years. It's taken a few years to get sales in thirty-six countries, but we're confident that with hard work we won't have too much trouble increasing that number.

What is learned about Wellington Corporation？

A．It has sales in 36 countries.

B．It increased its sales by 18 percent.

C．It recently opened an office in London.

D．It sells products through its Website.

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第3题

How many Timeslots do each TRU use on the A－bis link when utilizing the three differe

How many Timeslots do each TRU use on the A-bis link when utilizing the three different methods of lapd signaling？

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第4题

A．On the ground.B．In cold places.C．On the highest branches of trees.D．Inside three tru

A．On the ground.

B．In cold places.

C．On the highest branches of trees.

D．Inside three trunks.

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第5题

听力原文：St. Valentine's Day has roots in several different legends that have found their

听力原文： St. Valentine's Day has roots in several different legends that have found their way to us through the ages. One of the earliest popular symbols of the day is Cupid, the Roman god of love, who is represented by the image of a young boy with bow and arrow.

Three hundred years after the death of Jesus Christ, the Roman emperors still demanded that everyone believe in the Roman gods. Valentine, a Christian priest, had been thrown in prison for his teachings. On February 14, Valentine was beheaded, not only because he was a Christian, but also because he had performed a miracle. He supposedly cured the jailer's daughter of her blindness. The night before he was executed, he wrote the jailer's daughter a farewell letter, signing it "From Your Valentine." Another legend tells us that this same Valentine, well-loved by all, received notes to his jail cell from children and friends who missed him.

Another Valentine was an Italian bishop who lived at about the same time, AD 200. He was imprisoned because he secretly married couples, contrary to the laws of the Roman emperor. Some legends say he was burned at the stake.

(26)

A．3.

B．4.

C．5

D．6

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第6题

What is the checkpoint？Please describe the main functions of three checkpoints in cell cyc

le．

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第7题

How many crystal systems are there？ How many patterns can atoms form with these crystal systems？ Wha

t are the three types of unit cell that atoms form with cubic crystal system？ (Note: full spelling and abbreviation are required for each type)

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第8题

If used ______, even the most poorly designed cell phone should be able to function for at

least three years.

A．continuously

B．sparingly

C．fortunately

D．uncertainly

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第9题

Antibiotics are drugs produced by certain microbes. Antibiotic substances are obtained

from bacteria and fungi that live in the air, soil, and water. Most antibiotics are used by physicians to fight various diseases caused by harmful microbes. A few are used to treat certain cancers. Antibiotics are sometimes called" wonder drugs 'because they can cure many diseases that once were often fatal. The number of deaths that are caused by pneumonia and scarlet fever has declined drastically since people began using antibiotics.

2. There are more than 70 clinically useful antibiotics, Antibiotics fight pathogenic microbes and cancer cells by interfering with their normal cell processes. In most cases, this interference can occur in one of three ways: prevention of cell wall formation, disruption of the cell membrane, and disruption of chemical processes.

3. The contents of bacterial cells are enclosed in a membrane that is surrounded by a rigid wall that prevents the cells from splitting open. Penicillins and some other antibiotics destroy pathogenic microbes by hindering the formation of this wall. Human cells do not have nor need rigid cell walls and so are not damaged by these antibiotics.

4. Some antibiotics, including nystatin, disrupt the cell membrane of certain microbes. This membrane controls the movement of materials in and out of the cell. If the membrane is disrupted, vital nutrients may escape from the cell, or poisonous substances may enter and kill the cell. But the membranes of human cells are not affected because these antibiotics disrupt cell membranes that contain elements found only in microbial cells.

5. All cells produce proteins and nucleic acids, which are vital to the life of any organism. Some antibiotics fight disease by interfering with the chemical processes by which these substances are produced. For example, streptomycin prevent certain kinds of microbes from producing proteins, and rifampin interferes with the formation of nucleic acids. Human cells produce proteins and nucleic acids in much the same way that microbial cells do. But these processes differ enough so that some antibiotics interfere with chemical activities in microbial cells but not in human cells.

A. Autibiotics destroy pathosenic microbes by preventing the formation of the walls surrounding the membranes of the microbial cells that prevent the cells from split- ting open.

B. More than 70 clinically useful antibiotics have been in- vented to fight pathogenic microbes and cancer cells by interacting with their normal cell processes.

C. Human cells are not surrounded by a membrane

D. Some antibiotics disrupt the cell membrane of certain microbes, letting vital nutrients to escape form. the cell or poisonous substances to enter and kill the cell.

E. Nystatin is used to disrupt the wall surrounding the membrane.

F. Some antibiotics fight disease by interfering with chemical activities in microbial cells but not in human cells.

Paragraph 2______。

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第10题

Which of the following can be concluded from the first paragraph？A．That cell phones are ha

Which of the following can be concluded from the first paragraph？

A．That cell phones are harmful to people's health is unconvincing.

B．Cell phones can bring more benefits to people than harm.

C．People won't worry about the harm cell phones do any longer.

D．There are only three types of benefits cell phones bring us.

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