题目内容
DHCP协议的功能是 (58) 。在Linux中提供DHCP服务的程序是 (59) ；DHCP服务将主机的MAC地址和IP地址绑定在一起的方法是在 (60) 文件中添加：“host主机名hardware Ethernet xx.xx.xx.xx.xx.xx fixed-address 192.168.0.9”配置项；创建DHCP租用文件的命令是 (61) ；通过运行 (62) 命令可以设置在操作系统启动时自动运行 DHCP服务。
查看答案
搜索结果不匹配？点我反馈
更多问题
2 Large, multinational corporations may be the companies whose ups and downs seize headlines. But to a far greater extent than most Americans realize, the economy’s vitality depends on the fortunes of tiny shops and restaurants, neighborhood services and facto- ries. Small businesses, defined as those with fewer than 100 workers, now employ nearly 60 percent of the work force and are expected to generate half of all new jobs between now and the year 2000. Some 1.2 million small firms have opened their doors over the past six years of economic growth, and 1989 will see an additional 200,000 entrepreneurs striking off on their own. Too many of these pioneers, however, will blaze ahead unprepared. Idealists will overestimate the clamor for their products or fail to factor in the competition. Nearly every one will underestimate, often fatally, the capital that success requires. Midcareer execu tives, forced by a takeover or a restructuring to quit the corporation and find another way to support themselves, may savor the idea of being their own boss but may forget that en trepreneurs must also, at least for a while, be bookkeeper and receptionist, too. According to Small Business Administration data, 24 of every 100 businesses starting out today are likely to have disappeared in two years, and 27 more will have shut their doors four years from now. By 1995, more than 60 of those 100 start-ups will have folded. A new study of 3,000 small businesses, sponsored by American Express and the National Federation of Independent Business, suggests slightly better odds: Three years after start-up, 77 percent of the companies surveyed were still alive. Most credited their success in large part to having picked a business they already were comfortable in. Eighty percent had worked with the same product or service in their last jobs. Thinking through an enterprise before the launch is obviously critical. But many entre- preneurs forget that a firm’s health in its infancy may be little indication of how well it will age. You must tenderly monitor its pulse. In their zeal to expand, small business owners often ignore early warning signs of a stagnant market or of decaying profitability. They hopefully pour more and more money into the enterprise, preferring not to acknowledge eroding profit margins that mean the market for their ingenious service or product has evaporated, or that they must cut the payroll or vacate their lavish offices. Only when the financial well runs dry do they see the seriousness of the illness, and by then the patient is usually too far gone to save. Frequent checks of your firm’s vital signs will also guide you to a sensible rate of growth. To snatch opportunity, you must spot the signals that it is time to conquer new markets, add products or perhaps franchise your hot idea. Which of the following statements about small business is NOT true
Networks can be interconnected by different devices．In the physical layer，networks can be connected by (66) or Hubs, which just move the bits from one network to an identical net-work. One layer up we find bridgas and swiehes, which operate at data link layer. They can accept (67) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two netwoks. If two networks have (68) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between the two transport connections. Finally, in the application layer, application gateways translate message (69) . As an example, gateways between Internet e-mail and X.400 e-mail must (70) the e-mail message and change various header fields.
4 The crucial years of the Depression, as they are brought into historical focus, in creasingly emerge as the decisive decade for American art, if not for American culture in general. For it was during this decade that many of the conflicts which had blocked the pro gress of American art in the past came to a head and sometimes boiled over. Janus-faced, the thirties look backward, sometimes as far as the Renaissance; and at the same time for ward, as far as the present and beyond. It was the moment when artists, like Thomas Hart Benton, who wished to turn back the clock to regain the virtues of simpler times came into direct conflict with others, like Stuart Davis and Frank Lloyd Wright, who were ready to come to terms with the Machine Age and to deal with its consequences. America in the thirties was changing rapidly. In many areas the past was giving way to the present, although not without a struggle. A Predominantly rural and small town society was be ing replaced by the giant complexes of the big cities; power was becoming increasingly centralized in the federal government and in large corporations. Many Americans, deeply attached to the old way of life, felt disinherited. At the same time, as immigration decreased and the population became more homogeneous, the need arose in art and literature to commemorate the ethnic and regional differences that were fast disappearing. Thus, paradoxically, the conviction that art, at least, should serve some purpose or carry some message of moral uplift grew stronger as the Puritan ethos lost its contemporary reality. Often this elevating message was a sermon in favor of just those traditional American virtues, which were now threat ened with obsolescence in a changed social and political context. In this new context, the appeal of the paintings by the regionalists and the American Scene painters often lay in their ability to recreate an atmosphere that glorified the traditional American values—self-reliance tempered with good-neighborliness, independence modified by a sense of community, hard work rewarded by a sense of order and purpose. Given the actual temper of the times, these themes were strangely anachronistic, just as the rhetoric supporting political isola tionism was equally inappropriate in an international situation soon to involve America in a second world war. Such themes gained popularity because they filled a genome need for a comfortable collective fantasy of a God-fearing, white-picketfence America, which in retrospect took on the nostalgic appeal of a lost Golden Age. In this light, an autonomous art-for-art’s sake was viewed as a foreign invader liable to subvert the native American desire for a purposeful art. Abstract art was assigned the role of the villainous alien; realism was to personify the genuine American means of ex pression. The arguments drew favor in many camps: among the artists, because most were realists; among the politically oriented intellectuals, because abstract art was apoliti cal; and among museum officials, because they were surfeited with mediocre imitations of European modernism and were convinced that American art must develop its own distinct identity. To help along this road to self-definition, the museums were prepared to set up an artificial double standard, one for American art, and another for European art. In 1934, Ralph Flint wrote in Art News, "We have today in our midst a greater array of what may be called second-, third-, and fourth-string artists than any other country. Our big annuals are marvelous outpourings of intelligence and skill~ they have all the diversity and anima tion of a fine-ring circus. \ According to the passage, the best word to describe America in the 1930s would be______.
局域网中使用的传输介质有双绞线、同轴电缆和光纤等。10BASE-T采用3类UTP，规定从收发端到有源集线器的距离不超过 (44) m。100BASE-TX把数据传输速率提高了10倍，同时网络的覆盖范围 (45) 。假设tPHY表示工作站的物理层时延，c表示光速，s表示网段长度，tR表示中继器的时延，在IOBASE-5最大配置的情况下，冲突时槽约等于 (46) 。光纤分为单模光纤和多模光纤，与多模光纤相比，单模光纤的主要特点是 (47) ，为了充分利用其容量，可使用 (48) 技术同时传输多路信号。
微信支付 
支付宝支付