c语言2022考试真题及答案

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1、Suppose there is exactly one packet switch between a sending host and a receiving host. The transmission rates between the sending host and the switch and between the switch and the receiving host are R1 and R2, respectively. Assuming that the switch uses store-and-forward packet switch, what is the totally end-to-end delay to send a packet of length L? (Ignore queuing delay, propagation delay and processing delay) A. L/R1+L/R2 B. L/R1 C. L/R2 D. none of the above
A:L/R1＋L/R2
B:L/R1‍
C:L/R2
D:none of the above
答案：L/R1＋L/R2
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2、如果一离散时间系统的系统函数的极点在单位圆上，则它的应是（ ）。
A、指数增长信号
B、指数衰减振荡信号
C、常数
D、等幅振荡信号
答案：等幅振荡信号
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3、巴黎汇流工作室马里奥 卡塞雷斯（Mario Caceres）和克里斯蒂安 堪瑙尼克（Christian Canonico）提出方案的核心是被称为“人造树”的空气净化设施。
答案：对
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4、信号到的运算中，若a>1，则信号的时间尺度缩小a倍，其结果是将信号的波形沿时间轴放大a倍。
答案：错
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5、让·皮埃尔·雷诺被誉为欧洲新现实主义的代表人物，创作手法多样，与植物和生命有关的花盆是他创作的重要主题。
A:对 B:错
答案：对
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6、2010年，由威尔士艺术家创作的二维公共艺术 ___这件作品选择了典型的负型设计方法，更接近绘画，这为作品带来了很多独特之处。
A、《海滩上的肖像画》
B、《北方天使》
C、《倾转此地》
答案：《海滩上的肖像画》
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7、What will the status code be in server-to-client response message when request msg not understood by server? A.200 B.301 C.400 D.404
答案：【计分规则】: Answer:C
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8、2012年落成于澳大利亚悉尼的老城区的 ，是近年来能够代表澳大利亚公共艺术最高水平的作品。
A、《光晕》（Halo）
B、《刀船》（（Knife Ship I）
C、《转动的轮子》
答案：《光晕》（Halo）
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9、出生于1958年的美国人基斯·哈林是较早运用剪影手法进行公共艺术创作的艺术家之一，其作品大多取名《无题》。
答案：√
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10、What is the difference between routing and forwarding?
答案：【计分规则】: Answer:Forwarding is about moving a packet from a router’s input port to the appropriate output port.(2 points)Routing is about determining the end-to-routes between sources and destinations.(2 points)the similar answers can be scored.
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11、What is peer to peer / virtual communication?
答案：【计分规则】: In order to transfer data packets from the source to the destination, each layer of the source OSI model must communicate with the peer layer of the destination, which is called peer layer communication.(2 points) In this process, the protocols of each layer exchange information between peers, which becomes protocol data unit (PDU). Located in each communication layer of the source computer, the PDU for that layer is used to communicate with the peer layer of the destination computer.(2 points)
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12、已知连续系统信号流图，取积分器的输出信号作为状态变量。
答案：对
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13、Given address/prefix of 131.167.211.67/29, please calculate the Network Address, Broadcast Address, First Usable Host address, and Last Usable Host Address.
答案：【计分规则】: Solution:131.167.211.64, 131.167.211.71,131.167.211.65,131.167.211.70.4 points for each question131.167.211.67→1000 0011.1010 0111.1101 0011.0100 0011the mask of the address 131.167.211.67/29 is1111 1111.1111 1111.1111 1111.1111 1000Let the mask and the IP address do the AND operation and the result is the network address.The host number which is all one is used as the broadcast addressFor the host addresses which are all zero and all one are unusable,so the first usable host address and the last usable host address are131.167.211.65,and 131.167.211.70
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14、What occasions are persistent and non-persistent connections suitable for?
答案：【计分规则】: Use a non-persistent connection for a single transmission(2 points), and use a persistent connection for multiple transmissions in a row(2 points).
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15、能动公共艺术进入21世纪后，在公共艺术技术含量提高的大背景下，逐渐出现概念泛化和主力转向等趋势。
正确
错误
答案：正确
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