单选题The task of the general design stage in structured life circle method is, to build what kind of software system structure?
单选题下列关于Cache的描述中,哪一个是错误的?
单选题下列选项中,哪一备份过程产生了数据不一致性,会导致数据的不可用
____
。
单选题If p and q are statements, which of the following formulas is tautological? ( )
单选题设学生关系S(S#,SNAME,SEX,DPAT)的主键为S#,学生选课关系SC(S#,C#,GRADE)的主键为S#和C#,则关系R(S#,C#,SEX,DPAT,GRADE)的主键为S#和C#,满足
单选题对于系统中的独占设备,为预防出现死锁。应采用的最佳分配策略是
单选题两个局域网互连,除它们的传输层协议不同之外,其他层协议均相同,则连接两个局域网的设备是
单选题以下不属于实现数据库系统安全性的主要技术和方法的是______。
单选题关于IM系统标准的描述中,正确的是
单选题A virtual memory system has five virtual pages numbered zero through four and three page frames. All the page frames are initially empty. How many page faults are generated with the following access sequence using a FIFO replacement policy? (2 Points)
0 1 2 3 0 1 4 0 1 2 3 4
单选题下列关于树形目录优点的叙述中,哪一个是错误的?
单选题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?
单选题下列关于ODBC的描述,错误的是( )。
单选题下列选项中,属于非对称密码体制的加密算法是
____
。
单选题语句GRANT、REVOKE、START TRANSACTION、COMMIT、ROBACK等属于SQL的下列哪一类语句?
单选题下列四组数中,可以充当4接阶无向简单图度数列的为
A) 1,2,3,4
B) 0,2,2,3
C)1,1,2,2
D)1,3,3,3
单选题In a computer,if a logical left shift of the operand occurs,its lowest bit is
单选题In the modulation style of PSK, if a kind of Modem's modulation rate is 3200baud and it's phase is 8, what is the data transfer rate of this kind of Modem ?
单选题A
单选题下列哪一种文件的物理结构检索速度慢,且不适于随机存取文件?
