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下面程序段的输出结果是()。 classBase { inti； Base() { add(1)； } voidadd(intV) { i+=v； } Voidphnt() { System.out.println(i)； } } Class EXtenSiOneXtendSBaSe { ExtensiOn() { add(2)； } voidadd(int v) { i+=v*2; } } public class TeSst { publicstatic voidmain(String argS[]) { bogo(new Extension())； } Static voidbogo(Base B) { b.add(8)； b.phnt()； } }
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One result of these problems has been a renewed discussion of the presence of substantial numbers of international students on U.S. campuses. Anecdotal reports suggest that the number of new international students entering the United States is declining.
The downward trend is consistent with data on the number of student visas being issued by the State Department. Applications by Arab and Muslim men and those of any student seeking to study science had to be sent to Washington for review, and men from 25 countries identified as potential harbors for terrorism face new registration requirements once they enter the United States.
These procedures led to long lines at U.S. consulates around the world and to many well-publicized situations in which students were unable to reach their intended campus in time for the opening of classes last autumn.
One continuing problem, university officials say, is that U.S. consulates no longer routinely renew visas for international students whose visas expire while they are home for vacations or other short visits.
The issue of whether some students will continue to view the United States as a desirable place to study has also become a source of discussion. John Shull, college adviser at the Cairo American College, said, "We are seeing more of our students looking at non-U.S, universities." Lynch of Penn State said that his university is now getting "very few new students from the Middle East—especially males".
Stricter U.S. restrictions on foreign students studying in America and delays in processing visa requests appear to be doing part of the job for the British. Applications to British universities from foreign students have surged in the last year, particularly from countries with predominantly Muslim populations.
Among countries sending significant numbers of students to Britain, the biggest increases in applications were from Saudi Arabia. Education officials did not provide reasons for this striking pattern. But some individual universities said there were indications that new U.S. regulations and stricter enforcement were playing at least some role. In Britain, students can also get an education in English, at internationally known universities, but perhaps with a bit less hassle.
Officials said that, while Britain did not impose new regulations on students seeking visas to study here, enforcement of existing rules and scrutiny of applications may have been stepped up. Admissions authorities say they have had more contact with the police, and they are being more diligent about requiting students to leave the country once their visas expire.
Still, either out of choice or necessity, some students apparently are finding Britain to be a more attractive option than the United States.
Why U.S. imposes so much on international students？
Above all else, small businesses want training that ______.
In what aspects are the new HOV and Alvin different？
Explorer of the Extreme Deep
Oceans cover more than two-thirds of our planet. Yet, just a small fraction of the underwater world has been explored. Now, Scientists at the Woods Hole Oceanographic Institution (WHOI) in Massachusetts are building an underwater vehicle hat will carry explorers as deep as 6,500 meters (21,320 feet). The new machine, known as a manned submersible or human-operated vehicle (HOV), will replace another one named Alvin which has an amazing record of discovery, playing a key role in various important and famous undersea expeditions. Alvin has been operating for 40 years but can go down only 4,500 meters (14,784 feet). It's about time for an upgrade ,WHOI researchers say.
Alvin was launched in 1964. Since then, Alvin has worked between 200 and 250 days a year, says Daniel Fornari, a marine geologist and director Of the Deep Ocean Exploration Institute at WHOI. During its lifetime, Alvin has carried some 12,000 people on a total of more than 3,000 dives. A newer, better versions of Alvin is bound to reveal even more surprises about a world that is still full of mysteries, Fornari says. It might also make the job of exploration a little easier. "We take so much for granted on land. " Fomari says. "We can walk around and see with our eyes how big things are. We can see colors, special arrangements. "
Size-wise, the new HOV will be similar to Alvin. It'll be about 37 feet long. The setting area inside will be a small sphere, about 8 feet wide, like Alvin. It'll carry a pilot and two passengers. It will be just as maneuverable. In most other ways, it will give passengers more opportunities to enjoy the view, for one thing. Alvin has only three windows, the new vehicle will have five, with more overlap so that the passengers and the pilot can see the same thing.
Alvin can go up and down at a rate of 30 meters every second, and its maximum speed is 2 knots (about 2.3 miles per hour), while the new vehicle will be able to ascend and descend at 44 meters per second. It'll reach speeds of 3 knots, or 3.5 miles per hour.
What is Alvin？
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