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2017計(jì)算機(jī)等級(jí)考試四級(jí)筆試必備題
計(jì)算機(jī)等級(jí)證書是我們找工作的敲門磚，現(xiàn)在越來(lái)越多人重視計(jì)算機(jī)等級(jí)考試。以下是百分網(wǎng)小編整理的2017計(jì)算機(jī)等級(jí)考試四級(jí)筆試必備題，歡迎學(xué)習(xí)!
(1) 網(wǎng)絡(luò)中的計(jì)算機(jī)之間要做到有條不紊地交換數(shù)據(jù)就必須遵守網(wǎng)絡(luò)協(xié)議，一個(gè)網(wǎng)絡(luò)協(xié)議主要包括三個(gè)要素，即____。
A) 語(yǔ)法、原語(yǔ)與數(shù)據(jù) B) 語(yǔ)義、數(shù)據(jù)與軟件
C) 層次、接口與原語(yǔ) D) 語(yǔ)法、語(yǔ)義與時(shí)序
(2) 當(dāng)PCM用于數(shù)字化語(yǔ)音系統(tǒng)時(shí)，它將聲音分為128個(gè)量化級(jí)，每個(gè)量化級(jí)采用7位二進(jìn)制碼表示。由 于采樣速率為8000樣本/秒，因此，數(shù)據(jù)傳輸速率應(yīng)該達(dá)到____。
A) 2880bps B) 56Kbps C) 144Kbps D) 1200bps
(3) 具有分時(shí)系統(tǒng)文件管理的全部功能，提供網(wǎng)絡(luò)用戶訪問(wèn)文件、目錄的并發(fā)控制與安全保密功能的局域網(wǎng)服務(wù)器叫做____。
A) 電子郵件服務(wù)器 B) WWW服務(wù)器
C) 文件服務(wù)器 D) FTP服務(wù)器
(4) 在網(wǎng)絡(luò)層實(shí)現(xiàn)多個(gè)局域網(wǎng)互連的設(shè)備是____。
A) 集線器 B) 網(wǎng)橋 C) 路由器 D) 網(wǎng)關(guān)
(5) 在WWW系統(tǒng)中，用戶可以根據(jù)需要自動(dòng)從一臺(tái)Web Server搜索到其他任何一臺(tái)Web Server，它所采用的是____。
A) 超文本(hypertext)技術(shù) B) 超鏈接(hyperlink)技術(shù)
C) 超媒體(hypermedia)技術(shù) D) 超文本標(biāo)注語(yǔ)言HTML
(6) Give the logical variables X=Y=1, The value of X V Y(logical addition)
is____.
A) 1 B) 2 C) 10 D) 0
(7) The Programming Counter (PC) is normally used to point out____.
A) Programmed execution instruction
B) The address of last execution instruction
C) The address of current execution instruction
D) The address of next execution instruction
Items (58) and (59) are based on the following Pascal code.
FOR i:=1 TO n -1 do
BEGIN
k:=i:
FOR j:=i+1 TO n DO
IF A[j]br> THEN k:=j:
IF k<>i
THEN BEGIN
X:=A[k];
A[k]:=A[i];
A[i]:=x
END
END;
(8) The sorting method described by the code is called____.
A) Insertion sort B) Selection sort C) Radix sort D) Merge sort
(9) Suppose elements in array A are already sorted ascending order of their
values when the code begins to run, then execution time of the code will be____.
A) O(log2n) B) O(n) C) O(nlog2n) D) O(n2)
(10) Assume that N=2M and FIFO is used. If the string p1,p2,…,pN is repeated
three times, then the number of page faults is____.
A) N/2 B) N C) 2N D) 3N
(11) Chang, Tian and An are three users of the system. Chang and An are in
the same group. Tian is a Super User. Which of the following rights is inconsistent
with the given policies?____.
A) Tian has W(write) access to An's Mail files
B) Tian has E(execute) access to An's Mail files
C) Chian has R(read) access to An's text files
D) Tian has E(execute) access to Chang's Binary files
(12) Software Engineering Economy is an effective part of software engineering,
which of the fo llowing content is the research comtent of software engineering
economy?____.
�、�.Estimation of software development cost
�、�.Earn & Cost analysis of software development
�、�.Adjustment of software development progress
A) Ⅲ only B) Ⅱ and Ⅲ C) Ⅰ and Ⅱ D) all
(13) Prototype method is one of the software engineering methods frequently
used, which of the following item is the necessary condition for implementing
prototype method?____.
�、�.Can acquire the user requirement quickly
�、�.Have the tools for building software fast
Ⅲ.Have a certain accumulation of prototype systems
A) Ⅰ only B) Ⅰand Ⅱ C) Ⅱ and Ⅲ D) all
(14) ORACLE RDBMS is a distributed DBMS. Which of the following techniques
adapted ensure atomicity of distributed transaction?____.
A) remote procedure call (RPC) B) Two _phases commit (2PC)
C) Snapshots D) triggers
(15) In order to get names of schoolboys(SEX='M')whose age=22, from a relation____.
S(SNO,SNAME,SEX,AGE),which of the following expressions is (are) correct?
Ⅰ.πsname(σsex='M'^age=22(S))
�、�.σsex='M'^age=22(πsname(S))
A) Ⅰ only B) Ⅱ only C) Ⅰand Ⅱ D) neither
(16) In order to improve the performance of a network server, you need to select
bus or local bus. The appropriate local bus is____.
A) VESA B) PCI C) EISA D) ISA
(17) In terms of M.J.Flynn's taxonomy, the systolic array falls into____.
A) SISD B) MIMD C) SIMD D) MISD
(18) In the WAN, when a point-to-point subnet is used, an important design
issue is the roucer interconnection____.
A) topology B) computer C) service D) lines
(19) In the Ethernet LAN, an algorithm was chosen to dynarnically adapt to
the number of stations trying to send. It is called____.
A) backward learning B) binary exponential backoff
C) spanning tree D) CRC
(20) The typical firewall consists of two packet filters and a (an)____.
A) router B) bridge C) application D) server
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