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A.22
B.44
C.8
D.3
E.46
答案
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
How many Timeslots do each TRU use on the A-bis link when utilizing the three different methods of lapd signaling？
第2题
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______。
第3题
Hwang's team has published some milestone papers in stem cell research.
A．Y
B．N
C．NG
第4题
When the cell has excess energy, it stores this energy by forming ______.
A．phosphate
B．ADP
C．AMP
D．ATP
第5题
A．blood cell
B．lung cell
C．liver cell
D．DNA
第6题
【C1】
A．materials
B．metals
C．reserves
D．fuels
第7题
Cell phone: your next computer
One hundred nineteen hours, 41 minutes and 16 seconds. That's the amount of time Adam Rappoport, a high school senior in Philadelphia, has spent talking into his silver Verizon LG phone since he got it as a gift last Christmas. That's not even the full extent of his habit. He also spends countless additional hours using his phone's Internet connection to check sports scores, download new ring-tones and send short messages to his friends' phones, even in the middle of class. "I know the touch-tone pad on the phone better than I know a keyboard," he says. "I'm a phone guy."
In Tokyo, halfway around the world, Satoshi Koiso also closely eyes his mobile phone. Koiso, a college junior, lives in the global capital of fancy new gadgets—20 percent of all phones in Tokyo link to the fastest mobile networks in the world. Tokyoites use their phones to watch TV, read books and magazines and play games. But Koiso also depends on his phone for something simpler and more profound: an anti-smoking message that pops up on his small screen each morning as part of a program to help students kick cigarettes.
Technology revolutions come in two flavors: greatly fast and imperceptibly slow. The fast kind, like the sudden ubiquity of iPods or the proliferation(增殖) of music-sharing sites on the Net, seem to instantly reshape the cultural lahdscape. The slower upheavals(巨变) grind away over the course of decades, subtly transforming the way we live and work.
There are 1.5 billion cell phones in the world today, more than three times the number of PCs. Mobile phones are so integral to our lives that it's difficult to remember how the life we ever got on without them.
Can the cell phone turn into the next computer？
As our phones get smarter, smaller and faster, and enable users to connect at high speeds to the Internet, an obvious question arises: is the mobile handset turning into the next computer？ In one sense, it already has. Today's most sophisticated phones have the processing power of a mid-1990s PC while consuming 100 times less electricity. And more and more of today's phones have computer-like features, allowing their owners to send e-mail, browse the Web and even take photos; 84 million phones with digital cameras were shipped last year. Change it into another same question, though, to ask to whether mobile phones will ever eclipse, or replace, the PC, and the issue suddenly becomes Controversial. PC proponents say phones are too small and connect too sluggishly to the Internet to become effective at tasks now performed on the luxuriously large screens and keyboards of today's computers. Fans of the phone respond: just wait. Coming innovations will solve the limitations of the phone. "One day, 2 or 3 billion people will have cell phones, and they are all not going to have PCs," says Jeff Hawkins, inventor of the Palm Pilot and the chief technology officer of PalmOne. "The mobile phone will become their digital life."
Smart cell phones
PalmOne is among the firms racing to trot out the full-featured computer-like phones that the industry dubs "smart-phones". Hawkins' newest product, the sleek, pocket-size Treo 600, has a tiny keyboard, a built-in digital camera and slots for added memory, etc. Other device makers have introduced their own unique versions of the smart-phone. Nokia's N-Gage, launched last fall, with a new version to hit stores this month, plays videogames. Motorola's upcoming MPx has a nifty "dual-hinge" design: the handset opens in one direction and looks like a regular phone, but it also flips open along another axis and looks like an e-mail device, with the expanded phone keypad serving as a small QWERTY keyboard. There axe also smart- phones on the way with video cameras, GPS antennas and access to local Wi-Fi hotspots, the snperfast wireless networks often found in offices, airp
A．Y
B．N
C．NG
第8题
What do we learn about a stem cell？
A．It has no difference from other cells.
B．It can only become a certain type of cell.
C．It can't become a kidney cell.
D．It maintains and repairs the body.
第9题
听力原文：M: Hello, this is the Lost and Found. Can I help you？
W: Yes, my name is Nora Darwin. This afternoon I left my cell phone carelessly in the library. I'm wondering whether it has been turned in yet.
Q: What do we learn from the conversation？
(17)
A．Nora lost her cell phone in the library.
B．Nora found her cell phone in the library.
C．Nora's cell phone has been turned in.
D．Nora's cell phone has been found in the library.
第10题
听力原文：M: Would you like to try the banana pie？ It's incredible.
W: Well, to tell the truth I don't care much for the dessert.
Q: What does the woman say about the banana pie？
(19)
A．It doesn't appeal to her.
B．It's incredibly delicious.
C．She has already tasted it.
D．There is no more left.
