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设在点x=0处连续，则a=（）。

（）

某工厂生产甲、乙两种主要设备，这两种设备均需要逐台按序经过两条装配线进行装配，有关数据与可获利润如下表所示。只要每周合理安排这两条装配线的生产顺序，该工厂可能获得的最大利润是（）万元。（注：第一装配线和第二装配线同时接通电源，且连续工作）。

假设磁盘上每个磁道划分成9个物理块，每块存放1个逻辑记录。逻辑记录R0，R1，…，R8存放在同一个磁道上，记录的安排顺序如下表所示。 
假定磁盘旋转一圈的时间为27ms，磁头当前处在R0的开始处。若系统顺序处理这些记录，使用单缓冲区，每个记录处理时间为3ms，则处理这9个记录的最长时间为（）；若对信息存储进行优化分布后，处理9个记录的最少时间为（）。

净室软件工程是软件开发的一种（）方法，可以开发较高质量的软件。它使用盒结构规约进行分析和建模，并将（）作为发现和排除错误的主要机制，采用统计测试来获取验证软件可靠性所需要的信息。

某数据库中有员工关系E、产品关系P、仓库关系W和库存关系I，其中各个关系的属性如下。
员工关系E(employeeID，name，department)的属性为：员工编号、姓名和部门。
产品关系P(productID，name，model，size，color)的属性为：产品编号、产品名称、型号、尺寸和颜色。
仓库关系W(warehouseID，name，address，employeeID)中的属性为：仓库编号、仓库名称、地址和负责人编号。
库存关系I(warehouseID，productID，quantity)中的属性为：仓库编号、产品编号和产品数量。
若要求仓库关系的负责人引用员工关系E的员工编号、仓库关系W的仓库编号和产品关系P的产品编号不能为空且唯一标识一个记录，并且仓库的地址不能为空，则依次要满足的完整性约束是（）
若需得到每种产品的名称和该产品的总库存量，则对应的查询语句为：
SELELCT name SUM(quantity)
FROM P,I
WHERE （）

假设某银行拥有的资金数是10，现在有4个用户a、b、c、d，各自需要的最大资金数分别是4、5、6、7。若在图a的情况下，用户a和b又各申请1个资金，则银行分配后用户a、b、c、d尚需的资金数分别为（）；假设用户a已经还清所有借款，其情况如图b所示，那么银行的可用资金数为（）。若在图b的情况下，银行为用户b、c、d各分配资金数1、1、2，则银行分配后用户b、c、d己用资金数分别为（）。

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
The purpose of the testing phase of software development is not to （） the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one’s intuitive notion of a successful test of a piece of （） ; however, a successful test is one in which errors have been found, net one in which no errors have been detected.
There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through （） , team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team.
After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the （） number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the （） of each module, but also the "rippling effects" of errors, and the interfaces among modules.

假设磁盘上每个磁道划分成9个物理块，每块存放1个逻辑记录。逻辑记录R0，R1，…，R8存放在同一个磁道上，记录的安排顺序如下表所示。 
假定磁盘旋转一圈的时间为27ms，磁头当前处在R0的开始处。若系统顺序处理这些记录，使用单缓冲区，每个记录处理时间为3ms，则处理这9个记录的最长时间为（）；若对信息存储进行优化分布后，处理9个记录的最少时间为（）。

净室软件工程是软件开发的一种（）方法，可以开发较高质量的软件。它使用盒结构规约进行分析和建模，并将（）作为发现和排除错误的主要机制，采用统计测试来获取验证软件可靠性所需要的信息。

假设某银行拥有的资金数是10，现在有4个用户a、b、c、d，各自需要的最大资金数分别是4、5、6、7。若在图a的情况下，用户a和b又各申请1个资金，则银行分配后用户a、b、c、d尚需的资金数分别为（）；假设用户a已经还清所有借款，其情况如图b所示，那么银行的可用资金数为（）。若在图b的情况下，银行为用户b、c、d各分配资金数1、1、2，则银行分配后用户b、c、d己用资金数分别为（）。

某数据库中有员工关系E、产品关系P、仓库关系W和库存关系I，其中各个关系的属性如下。
员工关系E(employeeID，name，department)的属性为：员工编号、姓名和部门。
产品关系P(productID，name，model，size，color)的属性为：产品编号、产品名称、型号、尺寸和颜色。
仓库关系W(warehouseID，name，address，employeeID)中的属性为：仓库编号、仓库名称、地址和负责人编号。
库存关系I(warehouseID，productID，quantity)中的属性为：仓库编号、产品编号和产品数量。
若要求仓库关系的负责人引用员工关系E的员工编号、仓库关系W的仓库编号和产品关系P的产品编号不能为空且唯一标识一个记录，并且仓库的地址不能为空，则依次要满足的完整性约束是（）
若需得到每种产品的名称和该产品的总库存量，则对应的查询语句为：
SELELCT name SUM(quantity)
FROM P,I
WHERE （）

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
The purpose of the testing phase of software development is not to （） the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one’s intuitive notion of a successful test of a piece of （） ; however, a successful test is one in which errors have been found, net one in which no errors have been detected.
There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through （） , team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team.
After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the （） number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the （） of each module, but also the "rippling effects" of errors, and the interfaces among modules.

假设某银行拥有的资金数是10，现在有4个用户a、b、c、d，各自需要的最大资金数分别是4、5、6、7。若在图a的情况下，用户a和b又各申请1个资金，则银行分配后用户a、b、c、d尚需的资金数分别为（）；假设用户a已经还清所有借款，其情况如图b所示，那么银行的可用资金数为（）。若在图b的情况下，银行为用户b、c、d各分配资金数1、1、2，则银行分配后用户b、c、d己用资金数分别为（）。

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
The purpose of the testing phase of software development is not to （） the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one’s intuitive notion of a successful test of a piece of （） ; however, a successful test is one in which errors have been found, net one in which no errors have been detected.
There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through （） , team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team.
After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the （） number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the （） of each module, but also the "rippling effects" of errors, and the interfaces among modules.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
The purpose of the testing phase of software development is not to （） the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one’s intuitive notion of a successful test of a piece of （） ; however, a successful test is one in which errors have been found, net one in which no errors have been detected.
There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through （） , team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team.
After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the （） number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the （） of each module, but also the "rippling effects" of errors, and the interfaces among modules.

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
The purpose of the testing phase of software development is not to （） the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one’s intuitive notion of a successful test of a piece of （） ; however, a successful test is one in which errors have been found, net one in which no errors have been detected.
There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through （） , team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team.
After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the （） number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the （） of each module, but also the "rippling effects" of errors, and the interfaces among modules.