【導(dǎo)讀】完成此管理程序能夠方便的管理校園網(wǎng)的交換機(jī)節(jié)點(diǎn)，減少管理員定時(shí)。開通或關(guān)閉子網(wǎng)的工作量。該程序使用VB自帶的Winsock控件tel到交換機(jī)。網(wǎng)的連通狀態(tài)，然后使用訪問控制列表來修改。言的應(yīng)用，了解軟件開發(fā)的過程，為以后進(jìn)一步的研究打好基礎(chǔ)。

　　

【正文】 equalitiesand inmensurabilities of goods to equality and mon measure?And this is what the power of money acplishes, and the merchant maybe said to be appointed for this purpose. The hireling and thetavernkeeper, and many other occupations, some of them more andothers less seemly alike have this object。they seek to satisfy ourneeds and equalize our possessions. Let us then endeavour to seewhat has brought retail trade into il lodour, and wherein, lies thedishonour and unseemliness of it, in order that if not entirely, wemay yet partially, cure the evil by legislation. To effect this isno easy matter, and requires a great deal of virtue. Cleinias. What do you mean? Athenian Stranger. Dear Cleinias, the class of men is smalltheymust have been rarely gifted by nature, and trained byeducationwho, when assailed by wants and desires, are able to holdout and observe moderation, and when they might make a great deal ofmoney are sober in their w ishes, and prefer a moderate to a largegain. But the mass of mankind are the very opposite: the ir desires areunbounded, and when they might gain in moderation they prefer gainswithout limit。 wherefore all that relates to retail trade, andmerchandise , and the keeping of taverns, is denounced and numberedamong dishonourable things. For if what I trust may never be andwill not be, we were to pel, if I may venture to say a ridiculousthing, the best men everywhere to keep taverns for a time, or carry onretail trade, or do anything of that sort。 or if, in consequence ofsome fate or necessity, the best women were pelled to followsimilar callings, then we should know how agreeable and pleasant allthese things are。 and if all such occupations were managed onincorrupt principles, they would be honoured as we honour a motheror a nurse. But now that a man goes to desert places and builds bouseswhich can only be reached be long journeys, for the sa ke of retailtrade, and receives strangers who are in need at the welerestingplace, and gives them peace and calm when they are tossed bythe storm, or cool shade in the heat。 and then instead of behavingto them as friends, and showing the duties of hospitality to hisguests, treats them as enemies and captive s who are at his mercy,and will not release them until they have paid the most unjust,abominable, and extortionate ransomthese are the sort of practices,and foul evils they are, which cast a reproach upon the succour ofadversity. And the legislator ought always to be devising a remedy forevils of this nature. T here is an ancient saying, which is also a trueoneTo fight against two opponents is a difficult thing, as isseen in diseases and in many other cases. And in this case also t hewar is against two enemieswealth and poverty。 one of whom corruptsthe soul of man with luxury, while the other drives him by pain intoutter shamelessness. What remedy can a city of sense find against thisdisease? In the first place, they must have as few retail traders aspossible。 and in the second place, they must assign the occupationto that class of men whose corruption w ill be the least injury tothe state。 and in the third place, they must devise some way wherebythe followers of these occupations themselves will not readily fallinto habits of unbridled shamelessness and meanness. After this preface let our law run as follows, and may fortunefavour us:No landowner among the Mages, w hose city the God isrestoring and resettlingno one, that is, of the 5040 families,shall bee a retail trader either voluntarily or involuntarily。neither shall he be a merchant, or do any service for privatepersons unless they equally serve him, except for his father or hismother, and their fathers and mothers。 and in general for his elderswho are freemen, and whom he serves as a freeman. Now it isdifficult to determine accur ately the things w hich are worthy orunworthy of a freeman, but let those who have obtained the prize ofvirtue give judgment about them in accordance with their feelings ofright and wrong. He who in any way shares in the illibe rality ofretail trades may be indicted for dishonouring his race by any one wholikes, before those who have been judged to be the first in virtue。and if he appear to throw dirt upon his father39。s house by anunworthy occupation, let him be imprisoned for a year and abstain fromthat sort of thing。 and if he repeat the offence, for two years。 andevery time that he is convicted let the le ngth of his imprisonmentbe doubled. This shall be the second law:He who engages in retailtrade must be either a metic or a stranger. And a third law shallbe:In order that the retail trader who dwells in our city may be asgood or as little bad as possible , the guardians of the law shallremember that they are not only guardians of those who may be easilywatched and prevented from being lawless or bad, because they a rewellborn and bred。 but still more should they have a watch overthose who are of another sort, and follow pursuits w hich have a verystrong tendency to make men bad. And, therefore, in respect of themultifarious occ upations of retail trade, that is to say, in respectof such of them as are allowed to remain, because they seem to bequite necessary in a stateabout these the guardians of the law shouldmeet and ta ke counsel w ith those who have experience of the severalkinds of retail trade, as we before manded, concerning adulteration(which is a matter a kin to this), and w hen they meet they shallconsider what amount of receipts, after deducting expenses, willproduce a moderate gain to the retail trades, and they shall fix inwriting and strictly maintain what they find to be the rightpercentage of profit。 this shall be seen to by the wardens of theagora, and by the wardens of the city, and by the wardens of thecountry. And so retail trade will benefit every one, and do theleast possible injury to those in the state who practis