Let R and S be the relation respective...

单项选择题

与快速以太网Fatt Ethernet相同之处是：千兆位以太Gigabit Ethernet同样保留着传统的10 Mbps Ethernet的基本特征，而且把每个比特的发送时间降低为

A．100ns
B．10ns
C．0.1ns
D．1ns

单项选择题

Internet的基本服务，如电子邮件E-mail、远程登录Telnet、文件传输FTP与WWW浏览等，它们的应用软件系统设计中都采用了

A．客户机/服务器结构
B．逻辑结构
C．层次模型结构
D．并行体系结构

单项选择题

An instruction that uses indrect addressing mustt contain an address of memory where

A．data is stored
B．a pipeline stall will be executed
C．a page fault is addressed
D．another address is stored

单项选择题

The principle for a stack memory to store data is

A．FIFO
B．FILO
C．random
D．other way

单项选择题

In the forest corresponding to the following binary tree, how many children does node B have

A．1
B．2
C．3
D．4

单项选择题

For the root of B tree of order m, the minimal number of its children

A．2
B．m/2
C．ém/2ù
D．.m

单项选择题

A disk scheduling mechanism in an operating system causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a

A．First Come First Serve
B．Shortest Seek Time First
C．Scan
D．None of the above

单项选择题

The construct
cobegin
Statement1;
Statement2;
coend
means Statement1 and Statement2 are to be executed in parallel. The only two atomic actions in this construct are loading the value of a variable and storing into a variable. For the program segment
x:=0;
y:=0;
cobegin
begin
x:=1,
y:=y+x;
end;
begin
y:=2;
x:=x+3;
end
coend
Which of the following indicate(s) possible values for the variables when the segment finishes execution
Ⅰ. x=1, y=2
Ⅱ. x=1, y=3
Ⅲ. x=4, y=6

A．Ⅰ
B．Ⅰand Ⅱ
C．Ⅰand Ⅲ
D．Ⅱand Ⅲ

单项选择题

Software maintenance is to do necessary modification, supplenemt, and completeness during software life circle. Among the following vary kinds of maintenance, which one has the maximum workload in a general way

A．relevance maintenance
B．completeness maintenance
C．correctness naintenance
D．other kinds of maintenance

单项选择题

Different quality factors of software can be reflected upon user"s different points of view, through product running, product modification and product transformation. Of the following properties, which one is connected with product running
Ⅰ. correctness Ⅱ. robustness Ⅲ. re-use

A．Ⅰonly
B．Ⅱonly
C．Ⅰ+Ⅱ
D．all of above

单项选择题

Let R and S be the relation respectively:
Relation R: A B C Relation S: B C D
1 2 3 2 3 4
6 7 8 2 3 5
9 7 8 7 8 1
The number of tuples that the result of the expression R ∞ S (Here is the natural join of relations R and S) is

A．3
B．4
C．6
D．9

单项选择题

Suppose we have the relation schema R(A,B,C,
D.with functional dependencies; F{A→B,B→C,C→D,D→A}, then R(A,B,C,D)at least is in

A．1NF
B．2NF
C．3NF
D．BCNF

单项选择题

By means of multiple pipeline to carry out multiple processing, this technology is called

A．Multiple pipeling
B．Superpipeline
C．Superscalar
D．Very long instruction word

单项选择题

There are many page replacement algorithms in the page management. Most frequently used algorithm is

A．FIFO
B．PPT
C．OPT
D．LRU

单项选择题

Layer n on one machine carries on a conversation with layer n on another machine. The rules and conventions used in this conversation are collectively known as the layer n

A．topology
B．protocol
C．service
D．peer

单项选择题

Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above

A．network layer
B．data link layer
C．transport layer
D．application layer

单项选择题

Every host and router on the Internet has an IP address, which encodes its

A．host number
B．host number and socket
C．network number
D．host number and network number

Let R and S be the relation respectively: Relation R: A B C Relation S: B C D 1 2 3 2 3 4 6 7 8 2 3 5 9 7 8 7 8 1 The number of tuples that the result of the expression R ∞ S (Here is the natural join of relations R and S) is

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与快速以太网Fatt Ethernet相同之处是：千兆位以太Gigabit Ethernet同样保留着传统的10 Mbps Ethernet的基本特征，而且把每个比特的发送时间降低为

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An instruction that uses indrect addressing mustt contain an address of memory where

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Suppose we have the relation schema R(A,B,C, D.with functional dependencies; F{A→B,B→C,C→D,D→A}, then R(A,B,C,D)at least is in

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1 2 3 2 3 4
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Ⅰ.通信量大
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Ⅲ.突发性
Ⅳ.层次性

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Relation R: A B C Relation S: B C D
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Suppose we have the relation schema R(A,B,C,
D.with functional dependencies; F{A→B,B→C,C→D,D→A}, then R(A,B,C,D)at least is in