Along with the arrival of lifestyle, MP4 as a stylish Wizard gradually into people's lives, since With it, people's life more exciting. However, as is a new product, many of my friends in the use and purchase, and so there are still quite a number of doubts, presented special "MP4 player 10 questions," I hope you will understand the MP4 players more deeply, the use of more successful .

First, choose suitable for their own MP4.

MP4 as a new digital products, a variety of forms, the time may purchase their own needs and economic conditions which weigh election. For high-end users can choose the 2.5-inch screen, the format support, can be played directly VCD, DVD files on the network and AVI video products, such products generally relatively high prices. In addition there is some support for the market, such as a single decoder ASF format flash-MP4, in the less well-off financially friends can think of the MP4 such as MP4 primary experience.

Secondly, the function of MP4 is not better, it is necessary to distinguish between the main and sub.

MP4 As technology improved, more and more integrated functional, multi-purpose nature is a good thing, and Xiaobian think that is not better, MP4 or MP4 end, we buy it is the fundamental purpose of the film is to see Lord, or to function with a series of video-based functions, other functions are supported, one can not expect the MP4 game than the game consoles, and do not expect a camera function with the MP4 can go to replace digital cameras. MP4 time in choosing the selection function is not to miscellaneous products (unless you are special needs or the like), but to ensure normal function on the basis of more personal view of the other capabilities of still very convenient.

Third, the right to select the right MP4 Players

MP4 when buying brands and function is important, but choosing a good dealer can not be overlooked. To the general election relatively good reputation on the market dealers. Can turn themselves on the market, if the store brand products are placed more more complex products but does not have its own prominent businessmen not to the election, in this business when you need products tend to call you, to elsewhere Nahuo They absolutely not dealers, not agents. As businessmen, from the purchase price of products and after-sales service will not be very satisfactory. And excellent prominent businessmen will have its own brand of products, goods can immediately get more such businesses are not agents is relatively large distributors, can be assured to purchase. Also to be more authoritative online merchants recommend some outstanding investigations. Only in this way will enable dealers aftermarket products are adequate safeguards, would prefer to spend more money is worth. Believe that a good business is a good product half.

Fourth, carefully MP4 businessmen "[trap"

Sometimes businesses will inevitably have to sell products is not competent, "Few Words About Huyou" for something. Some players that can be directly "RM / RMVB" document, but must be converted to normal after the broadcast, the so-called "Bi-RM RM this", there is a difference. There is attention should be paid to USB2.0 jack, USB2.0 jack actually there are two, one is "in full swing" and the other one is the "high speed." Xiaobian remind everyone here, only "high-speed USB 2.0 jack" is the real USB 2.0 jacks, in the purchase of the time must pay attention to Oh.

Fifth, the MP4 balance between price and value the relationship

We believe that the price has been on the run are very sensitive issue, and how to balance value and the relationship between the price to buy all the MP4 is the dream, and that Xiaobian First, we should look at before buying more and more users of the Internet comment on the article, there is check online quotes, and my heart has a background details, we may wish to introduce a number of products MP4 media website and look, there are many valuable information. When it's time to check the official media articles and quotations prevail, the Forum, some users to publish information sometimes with false personal and emotional elements, and can not be used as reference standards.

 

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◆ GPS in the application of road works
        GPS works in the application, is used mainly to the establishment of various road projects of aerial survey and control network, control points. With the rapid development of high-grade highway, the investigation has put a higher technical requirements, as long lines to know little point, therefore, not only by means of conventional cloth measuring network difficulties, it is difficult to meet the requirements of high accuracy. At present, the domestic use of GPS technology has been gradually established the First Circuit precision control network, and then use conventional methods laid wire encryption. Practice shows that, in dozens of kilometers of the point error only about two centimeters to the conventional method difficult to achieve the precision of, but also a much earlier time limit. GPS technology also used in the control of large bridge measurement. Visibility because of the need to form a strong network to enhance point accuracy At the same time, conventional measurements of the fulcrum also very effective. GPS technology in the measurement of the tunnel also has a wide range of potential applications-without GPS measurements as to reduce the conventional method of intermediate links, and, therefore, high speed and accuracy, with obvious economic and social benefits.

◆ GPS in car navigation and the application of traffic management
        Three-dimensional GPS navigation is the primary function of aircraft, ships, ground vehicles and the Pacers can use GPS Navigator for navigation. Car navigation systems in the GPS global positioning system developed on the basis of a new technology. Car navigation by GPS navigation system, self-navigation, microprocessor speed sensors, gyro sensors, a CD-ROM drive, an LCD display components. GPS navigation system with electronic maps, radio communications network, computer vehicle management information systems integration can be achieved vehicle tracking and traffic management, and many other functions.

(1) Vehicle Tracking

        Using GPS and the electronic maps that can show real-time location of the actual vehicle, and arbitrary zoom, reduction, for maps can be with the moving target, the goal has always been to maintain the screen; can achieve multi-window, multi-vehicle, multi-screen At the same time tracking. With this feature can be important to track vehicles and cargo transport.

(2) to provide travel route planning and navigation

        Provide travel route planning is a car navigation systems have an important complementary functions, including automatic route planning and design of artificial lines. Automatic route planning is determined by drivers starting point and destination, as requested by the computer software automatically design the best traffic routes, including the fastest route, the easiest route through the least number of sections of highway route calculations. Artificial lines designed by the drivers according to their destinations design starting point, destination and via point, the line automatically created. Line planning has been completed, the electronic display can be displayed on the design of the road map, and also showed that vehicles running path and method of operation. 　　

(3) Information

        To provide the main users of the standard, such as tourist attractions, hotels, hospitals and other databases, the user can display in the electronic map their location. At the same time, monitoring center console can be used within the region to monitor any location query target vehicles in the form of digital information will be electronic control centre on the map displayed.

(4) Traffic Command

        Command can monitor the operation of vehicles within the region to be monitored vehicles reasonable scheduling. Command may also be target tracking and call management.

(5) emergency assistance

        Through GPS positioning system and the monitoring and management of the event can be dangerous or incidents of vehicle emergency assistance. Monitoring Desk electronic map display help information and alarm objectives, planning optimal assistance programmes, and to remind the alarm sound and light duty emergency personnel.