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假设主频为100MHz的微处理器以非流水线方式访问存取时间为50ns的DRAM存储器，则在T1周期与T2周期之间至少应插入 【9】 个等待状态。
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扫描仪与计算机的接口一般有三种，其中一种是并行传输接口，它必须配有一块接口卡，通过该接口卡可以连接包括扫描仪在内的7～15个高速设备，其传输速度快，性能高，一般在专业应用场合使用。这种接口为 【17】 接口。
有以下程序： #include＜stdio.h＞ typedef struct int num；double s；)REC； void funl(REC x)x.num=23；x.s=88.5； main() REC a=16，90.0)； fun1(a)； printf("%d\n"，a.num)； 程序运行后的输出结果是______。
In a forest of mixed growth somewhere on the eastern spurs of the Karpathians, a man stood one winter night watching and listening, as though he waited for some beast of the woods to come within the range of his vision, and, later, of his rifle. But the game for whose presence he kept so keen an outlook was none that figured in the sportsman’s calendar as lawful and proper for the chase; Ulrich yon Gradwitz patrolled the dark forest in quest of a human enemy. The forest lands of Gradwitz were of wide extent and well stocked with game; the narrow strip of precipitous woodland that lay on its outskirt was not remarkable for the game it harboured or the shooting it "afforded, but it was the most jealously guarded of all its owner’s territorial possessions. A famous law suit, in the days of his grandfather, had wrested it from the illegal possession of a neighbouring family of petty landowners; the dispossessed party had never acquiesced in the judgment of the Courts, and a long series of poaching affrays and similar scandals had embittered the relationships between the families for three generations. The neighbour feud had grown into a personal one since Ulrich had come to be head of his family; if there was a man in the world whom he detested and wished ill to it was Georg Znaeym, the inheritor of the quarrel and the tireless game-snatcher and raider of the disputed border-forest. The feud might, perhaps, have died down or been compromised if the personal ill-will of the two men had not stood in the way. As boys they had thirsted for one another’s blood, as men each prayed that misfortune might fall on the other, and this windscourged winter night Ulrich had banded together his foresters to watch the dark forest, not in quest of fourfooted quarry, but to keep a look-out for the prowling thieves whom he suspected of being afoot from across the land boundary. The roebuck, which usually kept in the sheltered hollows during a storm-wind, were running like driven things tonight, and there was movement and unrest among the creatures that were wont to sleep through the dark hours. Assuredly there was a disturbing element in the forest, and Ulrich could guess the quarter from whence it came. The two enemies stood glaring at one another for a long silent moment. Each had a rifle in his hand, each had hate in his heart and murder uppermost in his mind. The chance had come to give full play to the passions of a lifetime. But a man who has been brought up under the code of a restraining eivilisation cannot easily nerve himself to shoot down his neighbour in cold blood and without word spoken, except for an offence against his hearth and honour. And before the moment of hesitation had given way to action a deed of Nature’s own violence overwhelmed them both. A fierce shriek of the storm had been answered by a splitting crash over their heads, and ere they could leap aside a mass of falling beech tree had thundered down on them. Ulrich yon Gradwitz found himself stretched on the ground, one arm numb beneath him and the other held almost as helplessly in a tight tangle of forked branches, while both legs were pinned beneath the fallen mass. His heavy shooting-boots had saved his feet from being crushed to pieces, but if his fractures were not as serious as they might have been, at least it was evident that he could not move from his present position till some one came to release him. The descending twig had slashed the skin of his face, and he had to wink away some drops of blood from his eyelashes before he could take in a general view of the disaster. At his side, so near that under ordinary circumstances he could almost have touched him, lay Georg Znaeym, alive and struggling, but obviously as helplessly pinioned down as himself. All round them lay a thick-strewn wreckage of splintered branches and broken twigs. The forest lands of Gradwitz have all the following features EXCEPT
Judging from tales about the rise and fall of empires, there is always a point when things are going so well that the emperors doubt that anything could ever go wrong. "Thrift," warned Nero’s adviser Seneca, "comes too late when you find it at the bottom of your purse. " In the Old World, nations grew fat and then lazy, until they collapsed under their own weight. But that was not to be our story. American greatness—the vision of the founders, the courage of the pioneers, the industry of the nation builders—reflected a mighty faith in the power of sacrifice as a muscle that made young nations strong. Banks were like gyms for the soul: the first savings banks in Boston and New York were organized as charities, where "bumble journeymen" could exercise good judgment, store their money and not be tempted to waste it on drink. Architect Louis Sullivan carved the word THRIFT over the door of his "jewel box" bank nearly a century ago, for it was private virtue that made public prosperity possible. That virtue died with the baby boom, but it had been ailing ever since the Depression, argues cultural historian David Tucker in the Decline of Thrift in America. That crisis, he writes, invited economists to recast thrift as "the contemptible vice which threw sand in the gears of our consumer economy. " A White House report in 1931 urged parents to let children pick out their own clothes and furniture, thereby creating in the child "a sense of personal as well as family pride in ownership, and eventually teaching him that his personality can be expressed through things. " Somewhere along the way, thrift did not just stop being a value; it became a folly. Saving was for suckers; you’d miss the ride, die leaving money on the table when you could have lived it up. There are no pockets in a shroud, as the saying goes. We once saved about 15% of our income. By the roaring 80s the rate was 4%; now we’re in negative numbers. Bob Hope liked to joke that "a bank is a place that will lend you money if you can prove that you don’t need it. " But that too changed as easy credit bloomed and usury became another of those vices that had somehow lost its juice. The average American has nine credit cards with a total $17, 000 balance. We borrow against our houses and pensions to live in a way that dares us to actually grow old. "Never invest in any idea you can’t illustrate with a crayon. " Fidelity mastermind Peter Lynch advised, but we embraced all kinds of investments about which we understood nothing except the hollow promise that they would never fail. When the economy began to swoon we kept spending, effectively sending ourselves rebate checks from accounts already way overdrawn, as if it would make us feel better to buy a new TV and charge it to our kids. George W. Bush has never been reluctant to frame policy debates in moral terms, targeting an "axis of evil", casting tax cuts as the removal of unfair burdens on hardworking people, calling tariff reduction a moral imperative. But thrift is one virtue he never invokes, and a restoration of restraint is a strain of conservatism he seldom promotes. In fact, it was after the most tragic day in modern U.S. history, when Bush urged people who wanted to help to go shopping, that profligacy officially replaced prudence as a patriotic duty. There’s no way to tell during this cun’ent distress whether we’re repenting or just retrenching. Thriftstore sales are up. Cats are shrinking. P. Diddy retired his private jet to save on gas. In hard times, people often rediscover the peace that prudence brings, when you try to spend a little less than you have because tomorrow might be worse. But that feels almost un-American; we’re optimists by nature, and we’ve been living large for so long that solvency feels like a sacrifice. It will take some sustained character education—and leadership—to understand that morning in America is more likely to come again if we prepare for midnight. According to the passage, which of the following statement is CORRECT
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