用面向对象方法设计了一个父类File和两个子类DiskFile和TapeFile，这两个子类继承了其父类的open方法，并给出不同的实现。不同的子类执行open方法时，有不同的行为，这种机制称为（ ）。

（ ）是当前自动化测试技术不能解决的问题

面向对象技术中，类之间共享属性与行为的机制称为（ ）。

自动化测试工具中，（ ）是最难自动化的

在引入自动化测试工具以前，手工测试遇到的问题包括（ ）。①工作量和时间耗费过于庞大②衡量软件测试工作进展困难③长时间运行的可靠性测试问题④对并发用户进行模拟的问题⑤确定系统的性能瓶颈问题⑥软件测试过程的管理问题

在引入自动化测试工具以前，手工测试遇到的问题包括（ ）。①工作量和时间耗费过于庞大 ②衡量软件测试工作进展困难③长时间运行的可靠性测试问题 ④对并发用户进行模拟的问题⑤确定系统的性能瓶颈问题 ⑥软件测试过程的管理问题

A.team is（ ）just a group of people who happen to work together.Teamwork takes practice and it involves special skills.Teams require common processes;they need agreed-upon goals;and they need effective guidance and leadership.The methods for guiding and leading such teams are well known,but they are not obvious.

A.team is（ ）just a group of people who happen to work together.Teamwork takes practice and it involves special skills.Teams require common processes;they need agreed-upon goals;and they need effective guidance and leadership.The methods for guiding and leading such teams are well known,but they are not obvious.

A.team is（ ）just a group of people who happen to work together.Teamwork takes practice and it involves special skills.Teams require common processes;they need agreed-upon goals;and they need effective guidance and leadership.The methods for guiding and leading such teams are well known,but they are not obvious.

A.team is（请作答此空）just a group of people who happen to work together.Teamwork takes practice and it involves special skills.Teams require common processes;they need agreed-upon goals;and they need effective guidance and leadership.The methods for guiding and leading such teams are well known,but they are not obvious.