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某计算机系统的可靠性结构是如下图所示的双重串并联结构，若构成系统的每个部件的可靠度均为0.9，即R=0.9。则该系统的可靠度为（）。

一台PC机通过调制解调器与另一台PC机进行数据通信，其中PC机属于（），调制解调器属于（）。调制解调器的数据传送方式为（）。

若每一条指令都可以分解为取指、分析和执行三步。已知取指时间t取指＝5△t，分析时间t分析＝2△t，执行时间t执行＝5△t。如果按顺序方式从头到尾执行500条指令需（）△t。如果按照［执行］k、［分析］k＋1、［取指］k＋2重叠的流水线方式执行指令，从头到尾执行500条指令需（）△t。

设有一个关系Student（学号，姓名，系名，课程号，成绩），查询至少选修了四门课程的学生学号、姓名及平均成绩的SELECT 语句应该是： SELECT 学号，姓名，AVG(成绩) AS 平均成绩 FROM Student GROUP BY （） HAVING （）

通过局域网连接Internet，需要设置TCP/IP协议的属性。对于固定IP的配置需要指定3个地址，即本机地址，（1）地址和（2）的地址。

在关系代数运算中，关系S、SP 和R 如下表所示。（） ，可以从S 和SP 获得R。其对应的关系表达式为（） 。如下的SQL 语句可以查询销售总量大于1000 的部门名。 Select 部门名 From S Where 部门号 in（Select 部门号 From SP Group by （） ）。

一台PC机通过调制解调器与另一台PC机进行数据通信，其中PC机属于（），调制解调器属于（）。调制解调器的数据传送方式为（）。

（）的任务是根据系统说明书中规定的功能要求，具体设计实现逻辑模型的技术方案，这个阶段形成的技术文档是（）。

ADSL对应的中文术语是（），它的两种Internet接入方式是（）接入。

在下面网络图中，节点4的最早开始时间是（），关键路径是（）。

ADSL对应的中文术语是（），它的两种Internet接入方式是（）接入。

若每一条指令都可以分解为取指、分析和执行三步。已知取指时间t取指＝5△t，分析时间t分析＝2△t，执行时间t执行＝5△t。如果按顺序方式从头到尾执行500条指令需（）△t。如果按照［执行］k、［分析］k＋1、［取指］k＋2重叠的流水线方式执行指令，从头到尾执行500条指令需（）△t。

（）的任务是根据系统说明书中规定的功能要求，具体设计实现逻辑模型的技术方案，这个阶段形成的技术文档是（）。

通过局域网连接Internet，需要设置TCP/IP协议的属性。对于固定IP的配置需要指定3个地址，即本机地址，（1）地址和（2）的地址。

设有一个关系Student（学号，姓名，系名，课程号，成绩），查询至少选修了四门课程的学生学号、姓名及平均成绩的SELECT 语句应该是： SELECT 学号，姓名，AVG(成绩) AS 平均成绩 FROM Student GROUP BY （） HAVING （）

一台PC机通过调制解调器与另一台PC机进行数据通信，其中PC机属于（），调制解调器属于（）。调制解调器的数据传送方式为（）。

在关系代数运算中，关系S、SP 和R 如下表所示。（） ，可以从S 和SP 获得R。其对应的关系表达式为（） 。如下的SQL 语句可以查询销售总量大于1000 的部门名。 Select 部门名 From S Where 部门号 in（Select 部门号 From SP Group by （） ）。

在下面网络图中，节点4的最早开始时间是（），关键路径是（）。

下面的程序段中，（） 是语句覆盖测试用例，（） 是判定覆盖测试用例。 if (a<80) b=0; else if (a<=150) b=5; else if (a<200) b=8; else b=1;

在关系代数运算中，关系S、SP 和R 如下表所示。（） ，可以从S 和SP 获得R。其对应的关系表达式为（） 。如下的SQL 语句可以查询销售总量大于1000 的部门名。 Select 部门名 From S Where 部门号 in（Select 部门号 From SP Group by （） ）。

MIDI enables people to use （） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （） ", the Hardware interface and a distribution （） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

Certificates are （） documents attesting to the （） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

下面的程序段中，（） 是语句覆盖测试用例，（） 是判定覆盖测试用例。 if (a<80) b=0; else if (a<=150) b=5; else if (a<200) b=8; else b=1;

Certificates are （） documents attesting to the （） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

MIDI enables people to use （） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （） ", the Hardware interface and a distribution （） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

MIDI enables people to use （） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （） ", the Hardware interface and a distribution （） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

Certificates are （） documents attesting to the （） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

MIDI enables people to use （） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （） ", the Hardware interface and a distribution （） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

Certificates are （） documents attesting to the （） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

MIDI enables people to use （） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （） ", the Hardware interface and a distribution （） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

Certificates are （） documents attesting to the （） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.