●设有一台计算机,它有一条加法指令,每次可计算三个数的和。如果要计算 79 个数的和,至少要执行的加法指令次数为__(61)__。
(61) A.37 | B.38 | C.39 | D.40 |
●若对所有 f>j,aij=O(i=1,2,…,n;j=1,2,…,n),则称矩阵 A=(ay)n×n 为上三角矩阵。设 Mn(R) 表示实数集R上全体 n×n 阶上三角矩阵的集合,“*”表示矩阵乘法,则
(62) A.可交换独异点 | B.非可交换的独异点 | C.非可交换的群 | D.阿贝尔群 |
●有权无向图如下,此无向图的最小生成树的权为__(63)__。
(63) A.25 | B. 44 | C.74 | D.92 |
●设二维随机变量(X,Y)服从N(0,0,1,1,0)正态分布,Φ(x)为标准正态分布函数,下列说法不正确的是__(64)__。
(64)A.随机变量 X 和 Y 均服从 N(0,1) 分布 | B.随机变量 X 和 Y 相互独立 |
C. X 和 Y 的联合分布函数为Φ(x)与Φ(y)的乘积 | D.Cov(X,Y)=1《 |
●设有程序段
i=1
while (i<=n)
i=i*2
上面程序段的时间复杂度为__(65)__。
(65) A.O(n) | B.O(log n) | C. O( nlog n) | D.O(n2) |
● Most IP layer-based proxy mechanisms, such as network address translation (NAT), only support uni-directional proxy, from the internal network to external network (the Internet). The proxy establishes the communication channel by __(66)__ IP addresses. The IP addresses must be __(67)__. These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software __(68)__ for each application that uses __(69)__ channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with __(70)__ IP addresses.
(66) A. manufacturing | B. manipulating | C. conduct | D. implement |
(67) A. routable | B. locatable | C. path-selected | D. road-defined |
(68) A. groups | B. blocks | C. models | D. modules |
(69) A. plenty | B. many | C. multiple | D. more |
(70) A. duplicating | B. crossing | C. overlapping | D. repeating |
●The approach we propose is a system-oriented methodology for knowledge acquisition This orientation emphasizes ongoing documentation throughout each cycle and technique applied. Program-wide documentation is suggested, both for the purpose of internal __(71)__ and for later verification and __(72)__ efforts. The documentation system we propose includes a central "knowledge acquisition __(73)__ " which is __(74)__ to reflect knowledge acquisition plans, session nodes, and domain expert participation. Specifically, __(75)__ within the database system include knowledge acquisition forms, which document plans for, and notes from,
knowledge acquisition session, domain expert file, and rule content forms.
(71) A. interchange | B. interface | C. communication | D. message |
(72) A. validation | B. confirm | C. effection | D. evaluation |
(73) A. dataset | B. collection | C. file | D. database |
(74) A. edited | B. updated | C. exchanged | D. revised |
(75) A. templates | B. samples | C. examples | D. temper |
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