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在无线通信中不能采用CSMA/CD方式，这是因为无线通信存在 (1) ，采用 CSMA/CA技术是指 (2) ，MAC层的分布式协调功能提供 (3) ，站点发出的确认帧ACK，要在 (4) 间隔发送。为解决隐蔽站带来的问题，802.11允许 (5) 。 1（）
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For each blank, choose the best answer from the four choices and write down on the answer sheet.(1) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(2) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.(3) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(4) is a device used to connect two separate network that use different communication protocol.(5) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative. 4（）
Linux系统的路由配置中，若设置静态路由，则需要 (1) 命令。在使用该命令时为了防止出现错误，可以用网络名字代替网络号，而网络名字可以在文件 (2) 中定义。为了将手工配置的命令存储下来，在系统启动时自动执行，可以通过 (3) 来实现。若运行动态路由，则 (4) 守护进程只支持RIP路由协议，而支持更多路由协议的进程运行时需要配置文件 (5) 。 2（）
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.In low-speed network, it is usually adequate to wait for congestion to occur and then react to it by telling the source of packets to slow down. In high-speed networks, this approach often works poorly, because in the (1) between sending the notification and notification arriving at the source, thousands of additional (2) may arrive. In ATM network, a major tool for preventing (3) is (4) control. When a host wants a new virtual (5) , it must describe the traffic to be offered and the service expected. 3（）
人民法院对张某、王某共同强奸户案作出判决，张某被判处死刑缓期二年执行，王某被判处拘役，判决确定后，两人被交付执行。 如果张某在死刑缓刑期间没有故意犯罪而被依法减刑为无期徒刑，又被再次减为有期徒刑，则下列说法正确的是：( )
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