单选题以下关于网络层次与主要设备对应关系的描述中，配对正确的是（ ）。

单选题就相同内容的计算机程序的发明创造，两名以上的申请人先后向国务院专利行政部门提出申请，则______可以获得专利申请权。

单选题Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile (71) , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be (72) until the process for creating the next body is complete. This is known as (73) Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as (74) , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to (75) , and often warning signs can even be spotted ahead of time to avoid 'it in the first place.

问答题从供选择的答案中选出应填入英语文句中()的正确的答案。 An instruction is made up of operations that (A) the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform the operation of (B) two numbers ,it must know (C) the two numbers are. The processor's job is to (D) instructions and operands from memory and to perform each operation .Having done that, it signals memory to send it (E) instruction. A: ① skip ② smile ③ smoke ④ specify B: ① add ② added ③ adding ④ addition C: ① when ② where ③ which ④ who D: ① get ② make ③ push ④ put E: ① ant ② last ③ next ④ second

问答题从供选择的答案中选出应填入下列叙述中()内的正确答案； 设w为一个二维数组，其每个数据元素占用6个字节，行下标i从。到8，列下标i从2到5，则二维数组W的数据元素共占用(A)个字节。w中第6行的元素和第4列的元素共占(B)个字节。若按行顺序存放二维数组w，其起始地址的字节号为100，则二维数组W的最后一个数据元素的起始地址的字节号为(C)，数据元素的起始地址号为(D)。 供选择的答案 A：①480 ②192 ③216 ④144 B：①78 ②72 ③66 ④84 C：①310 ②311 ③315 ④314 D：①179 ②178 ③184 ④185

下面软件结构图的深度、第二层的宽度、A模块的扇出和B模块的扇入分别为________。

专利制度的基本特点是 ________ 。

等值连接可由基本的关系运算1等价表达。给定关系贯、S如下图所示，则RS=2。

内存按字节编址，地址为0B4000H～0DBFFFH。若用存储容量为32K×8bit的存储器芯片构成该内存，至少需要______片。

填空题对于课程、教师与参考书3个实体型，如果一门课程可以有若干个教师讲授，使用若干本参考书，而每一个教师只讲授一门课程，每一本参考书只供一门课程使用，则课程与教师、参考书之间的联系是(　　)。

填空题自然连接是(　　)的一个重要特殊例子，它要求被连接的两关系(　　)。

填空题SQL语言使用(　　)语句创建基本表。

填空题如果模式只是BCNF，则R必是(　　)：反之，则(　　)成立。

填空题并发执行可能出现的3个主要问题是(　　)、(　　)和(　　)。

填空题对宿主式数据语言SQL，DBMS可采用两种方式处理，一种是(　　)，另一种是(　　)。

填空题数据库3个模式之间存在两级映射，一是(　　)间的映射，另一种是(　　)间的映射。

填空题(　　)是实际存储在数据库中的表：(　　)是从一个或几个基本表或其他视图导出的表，它本身不独立存储在数据库中。

填空题关系操作的特点是(　　)。

填空题数据仓库的4个基本特征是：(　　)、(　　)、(　　)和(　　)。