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香农定理描述了有限带宽、有随机热噪声信道的最大传输速率与信道带宽、 【4】 之间的关系。
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目前使用的标准网络管理协议包括：简单网络管理协议(SNMP)、公共管理信息服务/协议(CMIS/CMIP)和 【16】 等。
TEXT B President Clinton’s decision on Apr. 8 to send Chinese Premier Zhu Rongji packing without an agreement on China’s entry into the World Trade Organization seemed to be a massive miscalculation. The President took a drubbing from much of the press, which had breathlessly reported that a deal was in the bag. The Cabinet and White House still appeared divided, and business leaders were characterized as furious over the lost opportunity. Zhu charged that Clinton lacked "the courage" to reach an accord. And when Clinton later telephoned the angry Zhu to pledge a renewed effort at negotiations, the gesture was widely portrayed as a flip-flop. In fact, Clinton made the right decision in holding out for a better WTO deal. A lot more horse trading is needed before a final agreement can be reached. And without the Administration’s goal of a "bullet-proof agreement" that business lobbyists can enthusiastically sell to a Republican Congress, the whole process will end up in partisan acrimony that could harm relations with China for years. THE HARD PART. Many business lobbyists, while disappointed that the deal was not closed, agree that better terms can still be had. And Treasury Secretary Robert E. Rubin, National Economic Council Director Gene B. Sperling, Commerce Secretary William M. Daley, and top trade negotiator Charlene Barshefsky all advised Clinton that while the Chinese had made a remarkable number of concessions, "we’re not there yet," according to senior officials. Negotiating with Zhu over the remaining issues may be the easy part. Although Clinton can signal U. S. approval for China’s entry into the WTO himself, he needs Congress to grant Beijing permanent most-favored-nation status as part of a broad trade accord. And the temptation for meddling on Capital Hill may prove over-whelming. Zhu had barely landed before Senate Majority Leader Trent Lott (R-Miss) declared himself skeptical that China deserved entry into the WTO. And Senators Jesse A. Helms (R-N. C.) and Emest F. Hollings (D-S. C.) promised to introduce a bill requiring congressional approval of any deal. The hidden message from these three textile-state Southerners: Get more protection for the U. S. clothing industry. Hoping to smooth the way, the Administration tried, but failed, to budge Zhu on textiles. Also left in the lurch: Wall Street, Hollywood, and Detroit. Zhu refused to open up much of the lucrative Chinese securities market and insisted on "cultural" restrictions on American movies and music; He also blocked efforts to allow U. S. auto makers to provide fleet financing. BIG JOB. Already, business lobbyists are blanketing Capitol Hill to presale any eventual agreement, but what they’ve heard so far isn’t encouraging. Republicans, including Lott, say that "the time just isn’t right" for the deal. Translation: We’re determined to make it look as if Clinton has capitulated to the Chinese and is ignoring human, religious, and labor rights violations; the theft of nuclear-weapons technology; and the sale of missile parts to America’s enemies. Beijing’s fierce critics within the Democratic Party, such as Senator Paul D. Wellstone of Minnesota and House Minority leader Richard A. Gephardt of Missouri, won’t help, either. Just how tough the lobbying job on Capitol Hill will be become clear on Apr. 20, when Rubin lectured 19chief executives on the need to discipline their Republican allies, With business and the White House still trading charges over who is responsible for the defeat of fast-track trade negotiating legislation in 1997, working together won’t he easy. And Republicans—with a wink—say that they’ll eventually embrace China’s entry into the WTO as a favor to Corporate America. Though not long before they torture Clinton. But Zhu is out on a limb, and if Congress overdoes the criticism, he may be forced by domestic critics to renege. Business must make this much dear to both its GOP allies and the White House: This historic deal is too important to risk losing to any more partisan squabbling What was the attitude of the Republican Party toward China’s entry into the WTO
TEXT A His ignorance was as remarkable as his knowledge. Of contemporary literature, philosophy and politics he appeared to know next to nothing. Upon my quoting Thomas Carlyle, he inquired in the naivest way who he might be and what he had done. My surprise reached a climax, however, when I found incidentally that he was ignorant of the Copernican Theory and of the composition of the Solar system. "You appear to be astonished," Holmes said, smiling at my expression. "Now that I do know it I shall do my best to forget it. You see, I consider that a man’s brain originally is like a little empty attic, and you have to stock it with such furniture as you choose: A fool takes in all the lumber of every sort that he comes across, so that the knowledge which might be useful to him gets crowded out, or at best jumbled up with a lot of other things, so that he has difficulty in laying his hand upon it. It is a mistake to think that the little room has elastic walls and can distend to any extent. Depend upon it, there comes a time when for every addition of knowledge you forget something that you know before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones." "But the Solar System!" I protested. "What the deuce is it to me" he interrupted impatiently, One morning, I picked up a magazine from the table and attempted to while away the time with it, while my companion munched silently at his toast. One of the articles had a pencil mark at the heading, and I naturally began to run my eye through it. Its somewhat ambitious title was "The Book of Life," and it attempted to show how much an observant man might learn by an accurate and systematic examination of all that came in his way. It struck me as being a remarkable mixture of shrewdness and of absurdity. The reasoning was close and intense, but the deduction appeared to me to be far-fetched and exaggerated. The writer claimed by a momentary expression, a twitch of a muscle or a glance of an eye, to fathom a man’s inmost thought. Deceit, according to him, was impossibility in the case of one trained to observation and analysis. His conclusions were as infallible as so many propositions of Euclid. So startling would his results appear to the uninitiated that until they learned the processes by which he had arrived at them they might well consider him as a necromancer. "From a drop of water," said the writer, "a logician could infer the possibility of an Atlantic. So all life is a great chain, the nature of which is known whenever we are shown a single link of it. Like all other arts, the science of Deduction and Analysis is one which can be acquired by long and patient study, nor is life long enough to allow any mortal to attain the highest possible perfection in it." This smartly written piece of theory I could not accept until a succession of evidences justified it. What was the Holmes’ idea about knowledge-learning
TEXT C No one can be a great thinker who does not realize that as a thinker it is her first duty to follow her intellect to whatever conclusions it may lead. Truth gains more even by the errors of one who with due study and preparation thinks for himself, than by the true opinions of those who only hold them because they do not Suffer themselves to think. Note that it is solely, of chiefly, to form great thinkers that freedom of thinking is required. On the contrary, it is as much or even more indispensable to enable average human beings to attain the mental stature which they are capable of. There have been and many again be great individual thinkers in a general atmosphere of mental slavery. But there never has been, nor ever will be, in that atmosphere an intellectually active people. Where any of heterodox speculation was for a time suspended, where there is a tacit convention that principles are not to be disputed: where the discussion of the greatest questions which can occupy humanity is considered to be closed, we cannot hope to find that generally high scale of mental activity which has made some periods of history so remarkable. Never when controversy avoided the subjects which are large and important enough to kindle enthusiasm was the mind of a people stirred up fro9m its foundation and the impulse given which raised even persons of the most ordinary intellect to something of the dignity of thinking beings. She who knows only her own side of the case knows little of that. Her reasons may be food, and no one may have been able to refute them. But if she s equally unable to refute the reasons of the opposite side; if she does not so much as know what they are, she has no ground for preferring either opinion. The rational position for her would be suspension of judgment, and unless she contents herself with that, she is either led by authority, or adopts, like the generality of the world the side to which she feels the most inclination. Nor is it enough that she should heat the arguments of adversaries from her own teachers, presented as they state them, and accompanied by what they offer as refutations, That is not the way to do justice to the arguments, or bring them into real contact with her own mind. She must be able to hear them form persons who actually believe them’; who defend them in earnest, and do their very utmost for them. She must know them in their most plausible and persuasive form; she must feel the whole force of the difficulty which the true view of the subject has to encounter and dispose of; else she will never really possess herself of the portion of truth which meets and removes that difficulty. Ninety-nine in a hundred of what are called educated persons are in this condition; even of those who can argue fluently for their opinions. Their conclusion may be true, but it might be false for anything they know; they have never thrown themselves into the mental position of those who think differently form them and considered what such persons may have to say; and consequently they do not, in any proper sense of the word, know the doctrines which they themselves profess. According to the author, the person who holds orthodox beliefs without examination may be described in all of the following ways EXCEPT as ______.
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