What binary number is encoded with Dif...

单项选择题

本题中给出了四种描述(域定义)与相应术语之间的对应关系，请指出哪一组对应关系是正确的。
描述：
a. 信号的频率范围，在计算机网络中也用来表示数据传输速率。
b. 一个周期性函数可以表示为无数不同振幅、频率与相位的正(余)弦函数之和。
c. 信道容量是带宽与信噪比的函数。
d. 最大信号传输速率(bps)是信道带宽(Hz)数值的两倍。
术语：
1. 傅里叶(Fourier)原理 2. 带宽 3. Nyguist准则 4. Shannon定律

A．描述术语a 1b 2c 3d 4
B．描述术语a 2b 4c 1d 3
C．描述术语a 2b 1c 4d 3
D．描述术语a 2b 1c 3d 4

单项选择题

本题中给出了四种描述(域定义)与相应术语之间的对应关系，请指出哪一组对应关系是正确的。
描述：
a. 一种高性能的光纤令牌环网，它的数据传输速率为100Mbps，覆盖范围是200KM，可以连入的结点为1000个。
b. 这种网络保持着Ethernet的帧结构、接口与MAC方法等特点，只是将每个比特的发送时间由100ns减少为10ns。
c. 这种网络将所有传送的信息都以短的、固定长度的信元(cell)形式发送。每个信元长度为53字节。这种网络是面向连接的，并且具有极高的数据传输速率。
d. 这种网络用于一个城市范围内的多个LAN的互连，它使用IEEE 802.6协议。
术语：
1. FDDI 2. ATM 3. Fast Ethernet 4. DQDB

A．描述术语a 1b 3c 2d 4
B．描述术语a 1b 3c 4d 2
C．描述术语a 1b 2c 4d 3
D．描述术语a 2b 1c 4d 3

单项选择题

In the following statements about graph operations, which one is NOT correct

A．Spanning tree of a graph may not be unique.
B．Minimum spanning tree of a graph may not be unique.
C．Finding critical path is an operation on directed graph.
D．Finding critical path is an operation on undirected graph.

单项选择题

What storage scheme does MS-DOS use for storing files on a disk

A．I-nodes
B．a linked list allocation
C．a continuous allocation
D．a linked list with index

单项选择题

Which traversal method for a binary tree does the following Pascal code illustrate
procedure traverse(p:pointer);
begin
it p＜＞nil
then begin
traverse(p↑.left);
process(p);
traverse(p↑.right)
end
end;

A．Inorder
B．Preorder
C．Postorder
D．Reorder

单项选择题

Which of the followings is NOT a condition for deadlock

A．Starvation
B．Circular Wait
C．No Preemption
D．Mutual Exclusion

单项选择题

Assume that an operating system uses a round-robin scheduler. The process"s quantum is 20 msec, and the context switch is 5 msec. What percentage of the CPU"s time is spent on administrative overhead

A．5%
B．15%
C．20%
D．25%

单项选择题

What state is a process in when it can"t run because it needs a resource to become available

A．Ready
B．Interrupt
C．Blocked
D．Running

单项选择题

The following sectors are requested from the disk:
11,1,36,16,34,9,12
What is the order of the sector reads if you are using the elevator algorithm

A．1,9,11,12,16,34,36
B．11,1,36,16,34,9,12
C．11,12,9,16,1,34,36
D．11,12,16,34,36,9,1

单项选择题

What is the candidate key of a relational database

A．A field with a constraint placed on it.
B．A set of fields that have no data in them.
C．A set of fields in a table used to identify a record uniquely.
D．Fields from multiple tables that are used for sorting records.

单项选择题

What Normal From is the table shown in the exhibit
emps tbl
emp idemp_nameemp_phonedept_namedept_phonedept_mgrname
(1) emp_id→emp_name, emp_phone, dept_name(2) dept_name→ dept_phone, dept_mgrname

A．1NF
B．2NF
C．3NF
D．BCNF

单项选择题

Which operating system can Oracle database NOT be used in

A．DOS
B．UNIX
C．Windows95
D．IBM Mainframes

单项选择题

Which values are NOT permitted to be part of the primary key

A．NULL
B．punctuation
C．special characters
D．alpha-numeric characters

单项选择题

Which phase of the software engineering process results in the Software Requirements Specification

A．definition phase
B．engineering phase
C．maintenance phase
D．development phase

单项选择题

When drawing multilevel data flow chart of top-down, the balance between parent chart and son chart must be taken into account, and to pass judgment for the balance of the charts is regularly maintained by

A．Output data
B．Data dictionary
C．Processing number
D．Input data

单项选择题

Which is the strictest form of cohesion

A．logical
B．functional
C．procedural
D．coincidental

单项选择题

Which is NOT a concept of White Box Testing

A．You should execute all loops at their boundary conditions.
B．You should execute all interfaces at their boundary conditions.
C．You should execute all logical decisions on their true and false sides.
D．You should execute all independent paths within a module at least once.

单项选择题

Prototyping method is a dynamic design process, it requires people who use prototyping method should have the following capability

A．Proficient program expertise
B．Immediately acquire requirement
C．Coordinate & organize eloquently
D．Handle tools smartly

单项选择题

There are two styles in the evolution of instruction set, that is CISC and RISC. Which chip belongs to the RISC

A．i APX 432
B．VAX-11/780
C．Motorola 68000
D．Power PC

单项选择题

In advanced PC bus or local bus, which one has the fastest data throughput

A．ISA
B．PCI
C．MCA
D．EISA

单项选择题

There are many methods in the CPETT(short for Computer Performance Evaluation Tools and Techniques). One of them is the method that runs a Kernel as the load of a computer. So we call it

A．Monitor method
B．Benchmark method
C．Model method
D．Physical method

单项选择题

There are two common types in page replacement algorithm: stack and non-stack strategies. When a real page number increase only stack algorithm can increase the hit rate monotonously. In the following replacement algorithm, which one belongs to non-stack strategy

A．FIFO
B．LRU
C．PFF
D．OPT

单项选择题

What binary number is encoded with Differential Manchester in the diagram below

A．10110011100
B．11001100011
C．11000110010
D．00111001101

单项选择题

Each host or router on the Internet has its own IP address. There are four IP addresses as followings. Which IP address is erronedus

A．189.132.2.1
B．255.255.255.0
C．198.73.265.50
D．192.0.0.3

单项选择题

When should Frequency Division Multiplexing be used

A．when the attenuation on a medium is greater than 25%.
B．when the white noise on the medium exceeds 50% of the medium"s bandwidth
C．when the achievable data rate of the medium exceeds the data rate of the digital signals to be transmitted
D．when the useful bandwidth of the medium exceeds the required bandwidth of the digital signals to be transmited

单项选择题

The universe of hypertext servers that allow text, graphics, sound, and other multimedia files to be viewed togather and navigated via hypertext links. It is now the fastest growing area of the Internet. It is

A．Gopher
B．WWW
C．E-mail
D．FTP

What binary number is encoded with Differential Manchester in the diagram below

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Which operating system can Oracle database NOT be used in

Which values are NOT permitted to be part of the primary key

Which phase of the software engineering process results in the Software Requirements Specification

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Which is the strictest form of cohesion

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There are two styles in the evolution of instruction set, that is CISC and RISC. Which chip belongs to the RISC

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There are many methods in the CPETT(short for Computer Performance Evaluation Tools and Techniques). One of them is the method that runs a Kernel as the load of a computer. So we call it

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Which traversal method for a binary tree does the following Pascal code illustrate
procedure traverse(p:pointer);
begin
it p＜＞nil
then begin
traverse(p↑.left);
process(p);
traverse(p↑.right)
end
end;

The following sectors are requested from the disk:
11,1,36,16,34,9,12
What is the order of the sector reads if you are using the elevator algorithm

What Normal From is the table shown in the exhibit
emps tbl
emp idemp_nameemp_phonedept_namedept_phonedept_mgrname
(1) emp_id→emp_name, emp_phone, dept_name(2) dept_name→ dept_phone, dept_mgrname