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更多“Grid systems are important to …”相关的问题
A、basic systems and structures
B、political and social systems
C、governments and institutions
D、transportation and communication
本题是一个Applet，它的功能是在窗口上添加12×12个标签，并且横向和纵向标签的颜色为黑白相间。
import java．applet．*；
import java．．awt．*；
import java，．awt．event*；
pubhc class java2
extends Applet
{GridLayout grid；
pubhc void init（）
{grid=new GridLayout（12，12）；
setLayout（grid）；
Label =new Label[12][12]；
for（int i=0；i<；12；i++）
{for（int j=0；j<；12；j++）
{label[i][j]= ；
if（（i+j）％2= =0）
label[i][j]．setBackground（Color．black）；
else
label[i][j]．setBackground（color．white）；
add（label[i][j]）；
}
}
}}
A、使用ps设计网页界面过程中，将所有的层都格式化图层
B、栅格系统英文为“grid systems”，是从平面栅格系统中发展而来，以规则的网格阵列来指导和规范网页中的版面布局以及信息分布。通俗点讲是在网页界面设计中，运用固定的格子设计版面布局，使页面风格工整简洁
C、网页设计中，使用背景是格子样式的背景图案
D、在页面制作时，将所有的层宽度统一
B、在页面制作时，将所有的层宽度统一
C、栅格系统英文为“grid systems”，是从平面栅格系统中发展而来，以规则的网格阵列来指导和规范网页中的版面布局以及信息分布。通俗点讲是在网页界面设计中，运用固定的格子设计版面布局，使页面风格工整简洁
D、网页设计中，使用背景是格子样式的背景图案
eBay
eBay is a global phenomenon-the world's largest garage sale, online shopping center, ear dealer and auction site with 147 million registered users in 30 countries as of March 2005. You can find everything from encyclopedias to olives to snow boots to stereos to airplanes for sale. And if you stumble on it before the eBay overseers do, you might even find a human kidney or a virtual date.
eBay Basics
eBay is, first and foremost, an online auction site. You can browse through categories like Antiques, Boats, Clothing & Accessories, Computers & Networking, Jewelry & Watches and Video Games. When you see something you like, you click on the auction title and view the details, including pictures, descriptions, payment options and shipping information.
If you place a bid on an item, you enter a contractual agreement to buy it if you win the auction. All auctions have minimum starting bids, and some have a reserve price-a secret minimum amount the seller is willing to accept for the item. If the bidding doesn't reach the reserve price, the seller doesn't have to part with the item. In addition to auctions, you can find tons of fixed-price items on eBay that make shopping there just like shopping at any other online marketplace. You see what you like, you buy it, you pay for it and you wait for it to arrive at your door.
You can pay for an item on eBay using a variety of methods, including money order, cashier's check, cash, personal check and electronic payment services like PayPal and BidPay. It's up to each seller to decide which payment methods he'll accept.
Just as you can buy almost anything on eBay, you can sell almost anything, too. Using a simple listing process, you can put all of the junk in your basement up for sale to the highest bidder. When you sell an item on eBay, you pay listing fees and turn over a percentage of the final sale price to eBay.
Once you register (for free) with eBay, you can access all of your eBay buying and selling activities in a single location called "My eBay."
eBay Infrastructure
A series of service disruptions in 1999 caused real problems for eBay's business. Over the course of three days, overloaded servers intermittently shut down, meaning users couldn't check auctions, place bids or complete transactions during that period. Buyers, sellers and eBay were, very unhappy, and a complete restructuring of eBay's technological architecture followed.
In 1999, eBay was one massive database server and a few separate systems running the search function. In 2005, eBay is about 200 database servers and 20 search servers.
The architecture is a type of grid computing that allows for both error correction and growth. With the exception of the search function, everything about eBay can actually run on approximately 50 servers-Web servers, application servers and data-storage systems. Each server has between 6 and 12 microprocessors. These 50 or so servers run separately, but they talk to each other, so everybody knows if there is a problem somewhere, eBay can simply add servers to the grid as the need arises.
While the majority of the site can run on 50 servers, eBay has four times that. The 200 servers are housed in sets of 50 in four locations, all in the United States. When you're using eBay, you may be talking to any one of those locations at any time--they all store the same data. If one of the systems crashes, there are three others to pick up the slack.
When you're on the eBay Web site and you click on a listing for a Persian rug, your com-puter talks to Web servers, which talk to application servers, which pull data from storage servers so you can find out what the latest bid price is and how much time is left in the auction, eBay has local partners in many countries who deli
A．Virtual dates.
B．Any over-priced products.
C．Priceless antiques.
D．Rare animals for pets.
Mesoscale phenomena--the oceanic analogue of weather terms--often extend to distances of 100 kilometers and persist for 100 days (weather systems generally extend about 1 000 kilometers and last 3 to 5 days in any given area). More than 90 percent of the kinetic energy of the entire ocean may be accounted for by mesoscale variability rather than by large-scale currents. Mesoscale phenomena may, in fact, play a significant role in oceanic mixing air-sea interactions, and' occasional but far-reaching climate events such as EI Nino ,the atmospheric-oceanic disturbance in the equatorial Pacific that affects global weather patterns.
Unfortunately, it is not feasible to use conventional techniques to measure mesoscale fields. To measure them properly, monitoring equipments would have to be laid out on a grid at intervals of at most 50 kilometers, with sensors at each grid point lowered deep in the ocean and kept there for many months. Because using these techniques would be prohibitively expensive and time-consuming, it was proposed in 1975 that tomography (X射线断层摄影技术) be adapted to measuring the physical properties of the ocean. In medical tomography X-rays map the human body's density variations (and hence internal organs); the information from the X-rays, transmitted through the body along many different paths, is recombined to form. three-dimensional images of the body's interior. It is primarily this multiplicative increase in data obtained from the multi-path transmission of signals that accounts for oceanographers' attraction to tomography: it allows the measurement of vast areas with relatively few instruments. Researchers reasoned that low-frequency sound waves ,because they are so well described mathematically and because even small perturbations(动摇) in emitted sound waves can be detected, could be transmitted through the ocean over many different paths and that the properties of the ocean's interior-its temperature, salinity, density and speed of currents-could be deduced on the basis of how the ocean altered the signals. Their initial trials were highly successful, and ocean acoustic tomography was born.
Which of the following is TRUE according to Para. 1？
A．Nowadays, scientists pictured the circulation of ocean's water mass as consisting of large slow-moving currents.
B．Before 1965 ,the concept of scientists produced only a rough approximation of the true circulation.
C．Researchers began to do research on the developed techniques and equipment.
D．These instruments disclosed an expected level of variability in the deep ocean.
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