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Almost everyone in the world uses oil in some way. Without oil, the world will stop, so men look for it everywhere. Oilmen drill for oil in deserts, in mountains and under the sea. Quite often they find nothing, but the search for oil always goes on. Oil is very important because none of our machines can run without it. Big ships carry oil everywhere. Perhaps the oil in your motorbike or in your father’s car comes from somewhere far away. Perhaps it comes from Iraq or Venezuela. Cars and motorbikes need oil, and so do many other things. How many things can you name Your father’s car doesn’t need oil.
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某企业网对内部员工提供业余时间多媒体继续教育学习平台和视频点播(VOD)服务，并对内部开发人员提供协同办公所需的存储资源代码的服务器、财务数据服务器，对外提供Web服务和E-mail服务，同时部署了旁路模式的网络入侵检测服务器、网络流量监控服务器等。 通常，对以上服务器进行部署时：部署在核心交换机镜像端口的有______；部署在防火墙DMZ端口的有______。
When Tom left sch001．he did not really know what he wanted to do．He first worked in an office．but he found that it was boring．There was also the trouble with his second job in a carfactory. He then decided to work out of doors, and got a job as a gardener in a park. Now he works much harder than he did in the office or in the factory, because his work is more varied. He works the hardest in autumn and winter, keeping the park tidy and preparing forspring and summer. In summer he can relax and he can feel proud that he has helped to make thepark so beautiful. Many people visit the park and he is always pleased when he hears them sayhow lovely it looks. What was his third job He got his third job as ______ in a park.
【3】 技术是将数据和行为看成是一个统一的整体，使一个软件成分，即所谓的对象。
One of the most widely used routing protocols in IP networks is the Routing Information Protocol(RIP)．RIP is the canonical example of a routing protocol built on the (71) algorithm．Routing protocols in internetworks differ slightly from the idealized graph model．In aninternetwork，the goal of the routers to forward packets to various (72) ． Routers running RIP send their advertisement about cost every (73) seconds．A router also sends an update message whenever an update from another router causes it to change itsrouting table． It is possible to use a range of different metrics or costs for the links in a routing protocol．RIP takes the simplest approach，with all link costs being equal (74) Thus it always tries tofind the minimum hop route．Valid distances are 1 through (75) ．This also limits RIP torunning on fairly small networks．
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