你可能感兴趣的试题

两个公司希望通过Internet 进行安全通信保证从信息源到目的地之间的数据传输以密文形式出现，而且公司不希望由于在传输节点使用特殊的安全单元而增加开支，最合适的加密方式是 (1) ，使用的会话密钥算法应该是 (2) 。

两个公司希望通过Internet 进行安全通信保证从信息源到目的地之间的数据传输以密文形式出现，而且公司不希望由于在传输节点使用特殊的安全单元而增加开支，最合适的加密方式是 (1) ，使用的会话密钥算法应该是 (2) 。

在形式语言中，文法G是一个四元组G=(VN，Vr，P，Z)，其中VN为 (1) 。若文法C的产生式集P为：
(1)Z→Bc (2)Z→Zc (3)B→Ab (4)B→Bb (5)A→Aa (6)A→a
则文法G是 (2) 文法，识别G的自动机为 (3) 。对于G来说， (4) 为文法G可接受的字符串， (5) 为文法G不可接受的字符串。
供选择的答案：

在形式语言中，文法G是一个四元组G=(VN，Vr，P，Z)，其中VN为 (1) 。若文法C的产生式集P为：
(1)Z→Bc (2)Z→Zc (3)B→Ab (4)B→Bb (5)A→Aa (6)A→a
则文法G是 (2) 文法，识别G的自动机为 (3) 。对于G来说， (4) 为文法G可接受的字符串， (5) 为文法G不可接受的字符串。
供选择的答案：

在形式语言中，文法G是一个四元组G=(VN，Vr，P，Z)，其中VN为 (1) 。若文法C的产生式集P为：
(1)Z→Bc (2)Z→Zc (3)B→Ab (4)B→Bb (5)A→Aa (6)A→a
则文法G是 (2) 文法，识别G的自动机为 (3) 。对于G来说， (4) 为文法G可接受的字符串， (5) 为文法G不可接受的字符串。
供选择的答案：

在形式语言中，文法G是一个四元组G=(VN，Vr，P，Z)，其中VN为 (1) 。若文法C的产生式集P为：
(1)Z→Bc (2)Z→Zc (3)B→Ab (4)B→Bb (5)A→Aa (6)A→a
则文法G是 (2) 文法，识别G的自动机为 (3) 。对于G来说， (4) 为文法G可接受的字符串， (5) 为文法G不可接受的字符串。
供选择的答案：

在形式语言中，文法G是一个四元组G=(VN，Vr，P，Z)，其中VN为 (1) 。若文法C的产生式集P为：
(1)Z→Bc (2)Z→Zc (3)B→Ab (4)B→Bb (5)A→Aa (6)A→a
则文法G是 (2) 文法，识别G的自动机为 (3) 。对于G来说， (4) 为文法G可接受的字符串， (5) 为文法G不可接受的字符串。
供选择的答案：

用Huffman(霍夫曼)算法求带权的2，3，5，7，8的最优二叉树T，那么T的权为 (1) ， T中有 (2) 片树叶，共有 (3) 个结点。

因计算机硬件和软件环境的变化而作出的修改软件的过程称为 (1) ，为增加软件功能、增强软件性能、提高软件运行效率而进行的维护活动称为 (2) 。

用Huffman(霍夫曼)算法求带权的2，3，5，7，8的最优二叉树T，那么T的权为 (1) ， T中有 (2) 片树叶，共有 (3) 个结点。

因计算机硬件和软件环境的变化而作出的修改软件的过程称为 (1) ，为增加软件功能、增强软件性能、提高软件运行效率而进行的维护活动称为 (2) 。

用Huffman(霍夫曼)算法求带权的2，3，5，7，8的最优二叉树T，那么T的权为 (1) ， T中有 (2) 片树叶，共有 (3) 个结点。

算法的空间复杂度是指 (1) ，算法的时间复杂度是指 (2) 。

算法的空间复杂度是指 (1) ，算法的时间复杂度是指 (2) 。

一个局域网中某台主机的IP地址为176.68.160.12，使用20位作为网络地址，那么该局域网的子网掩码为 (1) ，最多可以连接的主机数为 (2) 。

在谓词演算中，P(A)是xP（x）的有效结论，根据是（）。

一个局域网中某台主机的IP地址为176.68.160.12，使用20位作为网络地址，那么该局域网的子网掩码为 (1) ，最多可以连接的主机数为 (2) 。

某软件公司欲构造一文件/目录树，采用（）进行设计所得类图如图所示。

命题公式
的合取范式为 (1) ，析取范式为 (2) 。

1（）

设（）

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
How does the developer of a large database system achieve (1) and data independence How does the developer make certain that stored items are (2) and do not simply disappear in the immensities of the database, as if in quicksand
One solution is to set up a (3) system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization.
A centralized system is (4) , but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not (5) such differences.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (5) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
How does the developer of a large database system achieve (1) and data independence How does the developer make certain that stored items are (2) and do not simply disappear in the immensities of the database, as if in quicksand
One solution is to set up a (3) system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization.
A centralized system is (4) , but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not (5) such differences.

命题公式
的合取范式为 (1) ，析取范式为 (2) 。

2（）

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (5) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
How does the developer of a large database system achieve (1) and data independence How does the developer make certain that stored items are (2) and do not simply disappear in the immensities of the database, as if in quicksand
One solution is to set up a (3) system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization.
A centralized system is (4) , but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not (5) such differences.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (5) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
How does the developer of a large database system achieve (1) and data independence How does the developer make certain that stored items are (2) and do not simply disappear in the immensities of the database, as if in quicksand
One solution is to set up a (3) system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization.
A centralized system is (4) , but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not (5) such differences.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (5) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
How does the developer of a large database system achieve (1) and data independence How does the developer make certain that stored items are (2) and do not simply disappear in the immensities of the database, as if in quicksand
One solution is to set up a (3) system, in which all data (the internal level), all records and files (the conceptual level), and all user interfaces (the external level) are controlled by one central programming group. This may seem the most useful solution. But worldwide enterprises such as the meteorological and satellite tracking networks, IBM, and General Motors gather and record information at a very large number of locations. To stay flexible and avoid top - heaviness, such an organization might want to avoid excessive centralization.
A centralized system is (4) , but it may not be responsive to user needs. This is particularly true in a large organization - the worldwide meteorological network, for example, Data-gathering methods in the Himalayas, the equatorial jungles are different in very possible way. It is reasonable to believe that the best choices for the corresponding data storage and access structures ought to be just as different. A centralized database system would not (5) such differences.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
With the implementation of (1) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (2) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (3) . For example, one computer may be a small single - user computer, while another may be a large (4) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (5) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.