(73) Which is local to a thread instead of a process? (2 Points)
A) a stack B) an open file C) a semaphores D) an address space
(74) What is a subselect statement?
A) a select statement that selects a subset of fields in a table
B) a select statement that returns a subset of the data in a table
C) a select statement that appears within another select statement
D) a select statement that returns a subset of the constraints on a field
(75)In developing a hospital database，it is determined that on the average，each
patient will have 6 treatments during a hospital stay. The averge length of a stay
is three days.The hospital has 1000 beds. There are on the average 800 patients
occupying beds each day.
The relationship between PATIENT and TREATMENT is l: M. The relationship between
PATIENT and BED is 1: 1， conditiona
If treatment record occurrences are
archived as soon as a patient is discharded from the hospital,how many occurrences
of the TREATMENT records will be stored in the TREATMENT database file on the
average? (2 Points)
A) 6，000 B) 4，800 C) 18，000 D)1，600
(76)Which of the following conditions will make a relation that is in first normal form
to be in second normal form?
Ⅰ．every non-key attribute is functionally dependent on the full set of primary key
attributes.
Ⅱ．no non-key attributes exist in the relation.
Ⅲ．the primary key consists of only one attribute.
A) Ⅰ only B) Ⅰand Ⅱ only C) Ⅰand Ⅲ only D) any of them
(77)The most commonly used locking level in implementing concurrency control is at
which of the following levels?
A) database B) table C) record D)field
(78) Which function is NOT served by building a prototype?
A) It takes the place of the final system.
B) It assists in gathering software requirements
C) It assists in estimating the cost of the project.
D) It is used as the foundation of the larger projects.
(79) S
oftware document is an important part of software and a basis of
software development phase.It also influnces software’s (2 Points)
A) Reusability B) Maintanence
C) Expansibility D) Portability
(80) Which phase of the software development requires the most
development time?
A) the design phase B) the testing phase
C) the maintenance phase D) the development phase
(81) Which of the following statements is correct? (2 Points)
A) The definition phase results in the Software Requirements Specification.
B) Testing is optional in software life cycle.
C) CASE tools can only aid in the design phase of a software life cycle.
D) A change during a later phase does not require the documentation of all
earlier phases to be updated.
(82)Black-box and white-box testing method are often used in software testing phase，
in which，the white-box is mainly used to test software’s
A) reasonableness of structure B) correctness of a program
C) external function of a program D) internal logic of a program
(83) How does Booth’s Algorithm improve binary multiplication?
A) It prevents
overflow. B) It prevents underflow.
C) It preserves the sign of the multiplication operation.
D) It enhances the speed of the operation significantly.
(84) A cache has 64 blocks; each block is 16 bytes.Which block does byte 1200 map to ?
A) 25 B) 60 C) 75 D)100
(85) Which is NOT a characteristic of an RISC processor?
A) a high clock speed
B) a highly optimized pipeline
C) a few general-purpose registers
D) a limited amount of small instructions
(86)You are performing two sums: the first is a sum of two scalar variables and the
second is a matrix sum of a pair of two- dimensional arrays-size 1000 by 1000. What
speedup is achieved when the calculations are performed on size 1000 processors?
(2 Points)
A) 50 B) 100 C) 999 D) none of the above
(87)According to Shannon’s equation， what is the channel capacity of an analog
voice-grade phone line with a bandwidth of 3100 Hz and a signal-to-noise ratio
or 30dB? (2 Points)
A) 9.1 Kbps B) 9.3 Kbps C) 30.9 Kbps D) 30.17 Kbps
(88)The X.25 standard
specifies three layers of functionality. Which layers of the
OSI model correspond to the X.25 layers?
A) the Physical，Network，and Session Layers
B) the Physical，Data Link，and Network Layers
C) the Physical，Data Link，and Transport Layers
D) the Physical，Session，and Presentation layers
(89)Which routing algorithm is described below?
It is a mechanism in which the setding station determines the route the frame
will follow and includes the routing information with the frame; bridges read
the routing information to determine if they should forward the frame.
A) Fixed Routing B) Spanning Tree
C) Source Routing D) Frame Forwarding
(90) Which OSI layer does a bridge operate at?
A) the Physical Layer B) the Network Layer
C) the Transport Layer D) the Data Link Layer
责任编辑：小草
