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You need to display the last names of those employees who have the letter "A" as the second character in their names. Which SQL statement displays the required results? （）
A . SELECT last_name FROM EMP WHERE last_ name LIKE '_A%';
B . SELECT last_name FROM EMP WHERE last name ='*A%'
C . SELECT last_name FROM EMP WHERE last name ='_A%';
D . SELECT last_name FROM EMP WHERE last name LIKE '*A%'
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By default， on the WLAN controller for a voice application using Cisco 7921 wireless IP phones. What is the percentage of RF bandwidth that can be dedicated to the phones？（）
A . 75 percent
B . 85 percent
C . 56 percent
D . 55 percent
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A: Can I use the phone in the hall? B:（）
A . You can use them.
B . I’m afraid.
C . Of course.
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https://assets.asklib.com/images/image2/2018072716062096402.jpg
You need to ensure that phone numbers are displayed in the following format : (###) ### - ###
Which markup segment should you use ?（）
A .https://assets.asklib.com/images/image2/2018072716062788209.jpg
B .https://assets.asklib.com/images/image2/2018072716063162364.jpg
C .https://assets.asklib.com/images/image2/2018072716063489045.jpg
D .https://assets.asklib.com/images/image2/20180727160638841.jpg
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You need to display the last names of those employees who have the letter “A” as the second character in their names.Which SQL statement displays the required results?（）
A . SELECT last_name FROM EMP WHERE last_name LIKE ‘_A%’;
B . SELECT last_name FROM EMP WHERE last name =’*A%’
C . SELECT last_name FROM EMP WHERE last name =’_A%’;
D . SELECT last_name FROM EMP WHERE last name LIKE ‘*A%&rsquo
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By default， on the WLAN controller for a voice application using Cisco 7921 wireless IP phones， what is thepercentage of RF bandwidth that can be dedicated to the phones？（）
A . 55 percent
B . 56 percent
C . 75 percent
D . 85 percent
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By default，on the wlan controller for a voice application using cisco 7921 wireless ip phones. what is the percentage of rf bandwidth that can be dedicated to the phones？（）
A . 75 percent
B . 85 percent
C . 56 percent
D . 55 percent
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Your portable computer has a built-in secondary display on the lid. You need to display your e-mail messages， calendar， and contacts on the secondary display. What should you do？ （）
A . Configure the e-mail， calendar， and contacts gadgets to be displayed on Microsoft Windows Sidebar.
B . Configure the e-mail， calendar， and contacts gadgets to be displayed on Microsoft Windows Sideshow.
C . Configure desktop shortcuts to Microsoft Windows Mail， Microsoft Windows Calendar， and Microsoft Windows Contacts.
D . Configure Quick Launch shortcuts to Microsoft Windows Mail， Microsoft Windows Calendar， and Microsoft Windows Contacts.
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When you enter the interface command auto qos voip cisco-phone on a port at the edge of a network,how does the Cisco Catalyst switch detect if a Cisco IP Phone is connected to the port?（）
A . by snooping the CoS marking on the incoming frames
B . by using RTP hello messages between the switch port and the Cisco IP Phone
C . by using CDP
D . by using DHCP snooping
E . by snooping the incoming 802.1Q VLAN tag
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In the future, our phone could see the world in the same way that we do.
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When I got into the room, Green as talking ______ the phone.
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If only we _________ a phone. I’m tied of queuing outside the public phone box.
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The wounded woman ______ to the phone to call the police.
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If only we___a phone! I’m tired of lining up outside the public phone box.
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How did Mr. Phillips sound on the phone?
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Some families in America and elsewhere have started buying child friendly mobile phones outfitted with GPS (Global Positioning System) technology.
These phones and their related tracking services allow parents to pinpoint the location of their children with ease. Parents agree to pick up the phone bill in return for the reassurance of knowing where their children are; children are prepared to put up with the watching if they are allowed to have a phone.
Mobile operators in America are now launching tracking services. Under a federal decree known as E911, they had to upgrade their networks to ensure that anyone dialing the 911 emergency number could be located to within 100 metres. Some operators opted for triangulation technology, which determines the location of the handset by comparing the signals received by different base stations. But Verizon and Sprint chose to adopt the more expensive but more accurate GPS technology instead, and are now looking for ways to make money from it.
Verizon calls its service "Chaperone". For $10 a month, parents can call up the location of their child's LG Migo handset from their own mobile phones, or from a PC. The child receives a message saying that the handset's position has been requested, and the parents receive an ad dress, or a marker on a web-based map, giving the child's location. For an extra $10 per month, they can sign up for Child Zone, a service that, among other things, fires off an alert when a youngster (or, at least, the youngster's handset) strays outside a specified area.
For its part, Sprint has launched a similar service that can also let parents know when a child arrives at a particular location.
Another location service is available from Nextel, a mobile operator that was taken over by Sprint in 2005. Nextel opened up some of its systems to enable other firms to build their own software and services on top of its GPS technology. One example is AccuTracking, a small company which offers a tracking service for $6 a month and boasts that it is "ideal for vehicle tracking" or to keep "virtual eyes on kids". Some customers are also using the service to track their spouses, by hiding phones in their cars. "Mine is hidden under the hood, hot-wired to the battery—it works very well and it is easy to hook up continuous power, "writes one customer on AccuTracking's message board.
Start-ups are working on everything from city-wide games of hide-and-seek to monitoring the locations of Alzheimer's patients. Services that monitor jogging routes, and work out distance travelled and calories consumed, might also prove popular.
As a result, mobile operators, handset-makers and start-ups could transform. and expand a small, specialist market so far dominated by expensive, dedicated tracking systems.
The tracking function of the mobile networks was probably first intended for ______.
A．federal officials
B．national security
C．parent consumers
D．emergency rescue
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If only we______（have)a phone! I'm tired of waiting outside the public phone box.
If only we______(have)a phone! I'm tired of waiting outside the public phone box.
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The difference between modem cell phones and old phones lies in that _____.
A．it requires more intelligence and education to use modern cell phones
B．it takes more weeks to get familiar with modern cell phones
C．modern cell phones are more complicated with many functions
D．modern cell phones are more mysterious tools for people
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The Flying Phone Box
A surprise for air travelers
The strides made in satellite-communications technology in recent years are at last yielding benefits for air travelers, particularly executives who need to keep in touch with their offices. Five airlines— three of them based in the Asia-Pacific region—have recently equipped aircraft to offer outbound (向外的)telephone calls to anywhere in the world using a new satellite system. And in the not-too-distant future, businessmen will be able to send faxes in flight, too.
Air Canada, Qantas of Australia, United Airlines of the US and Japan Air Lines have at least one satellite-communication aircraft apiece. Hong Kong's Cathay Pacific Airways is also about to offer the service and several other airlines are expected to follow. The calls, dialed directly and charged to a credit card, will cost about US $ 9 ～ 10 per minute.
The earlier flying phones
Phone communications from aircraft are not entirely new. For some time, telephones have been available to passengers on US internal flights, for example, and on private jets.
But these systems have used cellular phones operating on very high frequency radio links. These systems—the same links that keep pilots in touch with flight controllers—have either limited range or low quality and reliability, particularly over vast oceans such as the Pacific. By contrast, the new satellite service will provide clear links instantly to destinations around the world.
Technological obstacles
Several technological problems had to be resolved before the service could be introduced. One was to define an effective technical standard, Airinc 741, that guarantees compatibility among different manufacturers' avionics systems—essential if the service was to be truly global.
Another was to make reliable antennas(天线) small enough and light enough to mount on aircraft of different types. And a third was to perfect voice-coding algorithms(规则系统), which tell machinery how to break down voice signals into digital signals for transmission at the standard rate of 9,600 bits a second.
A further drawback, for any type of call routed by satellite, is an uncomfortable time lag between words being spoken and received. Because of the distance that signals have to travel, there is a delay of about a quarter of a second. With airborne calls, there is the potential for a double delay as signals arriving via satellite at a ground station are passed on via another satellite to their destination.
To avoid this problem, ground stations have been equipped to identify calls from aircraft and route them to coaxial or fibre-optic cables for the second lag of their journey. Surface links, though long, are still considerably shorter than the 72,000-km round-trip into space. Most calls will therefore not suffer the double delay.
The International Maritime Satellite Organization (Inmarsat) approved the initial sitcom system for commercial service last November 'after two years of trials. Besides the handful of aircraft operated by the five major carriers who have signed on to the system, about two dozen company jets have fitted with the necessary equipment.
A new technology
The technology has three components: antennas and associated equipment on board planes, communications satellites, and ground stations.
In the course of development, antennas have lust both their dish shape and several kilograms. Even so, antenna and avionics weigh as much as two occupied scats. One obstacle to further weight savings, however, is that lighter antennas are more easily confused by the plethora(过多) of satellites now circling the Earth.
The satellites themselves are provided by Inmarsat, a London-based cooperative of 64 nations. One operational satellite and several 'back-ups
A．Y
B．N
C．NG
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Other special display opportunities are ads in magazine, the another special display opportunity for advertisers is the______.
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A user states that the LCD display on their laptop has intermittent lines on the screen. The technician notices that when the display panel is moved, the line appears and then disappears. Which of the
A．The hinge on the display panel is damageD．
B．The display cable is loose or damageD．
C．The display panel is defectiv
E．
D．The video controller on the system board is defectiv
E．
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The term “mobile phone newspapers” refers to the news published in regularly recurring text and spread through mobile phones. The statement is a fact.
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听力原文：W: What a memory I have! I did write down the phone number on a sheet of paper when I answered the phone this morning. But now the paper has disappeared without any trace.
M: Don't worry. I will be seeing Mr. Brown in an hour.
What do we learn from the conversation？
A．It was probably Mr. Brown's phone number that the woman wrote down.
B．It was just an hour ago that the man met Mr. Brown.
C．The woman forgot to write down the phone number.
D．The woman needed a sheet of paper to put down the number.
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The two callers in the first phone call don’t know each other.（）
是
否
