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【简答题】
有一个虚存系统,某进程占用3个内存块,开始时内存为空,执行如下访问页号序列:1,2,3,4,1,2,5,1,2,3,4,5, (1)采用先进先出(FIFO)淘汰算法,缺页次数是 次; (2)采用最近最久未使用(LRU)淘汰算法,缺页次数是 次; (3)如果将进程占用的内存块改为4个内存块,执行上述页号访问序列,采用先进先出(FIFO)淘汰算法,缺页次数是 次,采用最近最久未使用(LRU)淘汰算法,缺页次数是 次; (思考:比较上述结果,看看你会得出什么有趣的结论?)
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【单选题】我国的视频监控系统发展了短短二十几年时间，按照技术角度为其发展排序（） ①模拟-数字视频监控系统 ②传统模拟闭路视频监控系统 ③IP视频监控系统
A.
.①②③
B.
②①③
C.
③①②
D.
②③①
【简答题】从所给的选项中选出5个句子完成下列对话，其中多余2项。 A. Only a little. B. Thank you. C. My name is Li Xiaopeng. D. What about you? E. Where are you from? F. How far is your home from here? G. My parents work there. A: Are you...
【单选题】下列关于依靠克隆的物理作图的说法中不正确的是
A.
依靠克隆的物理作图与序列标签位点作图互斥，不能同时使用
B.
其基本方法是根据基因组克隆文库中不同克隆的DNA片段之间的重叠顺序构建重叠群
C.
克隆文库是指基因组中的染色体断裂成片段，并将每个片段克隆到载体中所形成的库
D.
在基因组物理图谱绘制完成时，每条染色体都由一个单独的重叠群所覆盖
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A.
The program has been shown ever since 1969.
B.
The program became one of America’s major exports soon after it appeared on TV.
C.
The program are now being watched in most parts of the world.
D.
The program is made in the longest street in New York.
【简答题】Fill in the blanks according to the text. I began as a 1.__________ ________ in France in 12. In 1822 I was built as an 2._________ _______. Then in 1936 Alan Turing wrote a book and built a 3.____...
【单选题】视频监控系统中需要配置辅助照明设备,碘钨灯适宜配置在()中。
A.
黑白视频监控系统
B.
彩色视频监控系统
C.
黑白、彩色视频监控系统均可
D.
黑白、彩色视频监控系统均不适用
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【单选题】Now it became _______ that he spoke two languages at once.
A.
apparent
B.
evident
C.
approval
D.
plain
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