[单选题] 下面关于回归测试叙述正确的是（ ）

1、[单选题]What is the purpose of test completion criteria in a test plan ( ).

• A、to know when a specific test has finished its execution
• B、 to ensure that the test case specification is complete
• C、 to set the criteria used in generating test inputs
• D、 to know when test planning is complete
• E、to plan when to stop testing

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2、[单选题]Which one is not the task of test leader ( ).

• A、Coordinate the test strategy and plan with project managers and others
• B、 Decide about the implementation of the test environment
• C、 Write test summary reports
• D、 Review and contribute to test plans

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3、[单选题]The main focus of acceptance testing is ( ).

• A、finding faults in the system
• B、 ensuring that the system is acceptable to all users
• C、 testing the system with other systems
• D、 testing for a business perspective
• E、testing by an independent test team

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4、[单选题]有一个系统已经在市场上运行了，这种情况对系统进行修改，然后进行的测试是（ ）

• A、维护测试
• B、验收测试
• C、组件测试
• D、系统测试

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5、[单选题]Regression testing should be performed ( ).
v) every week
w) after the software has changed
x) as often as possible
y) when the environment has changed
z) when the project manager says

• A、v & w are true, x – z are false
• B、 w, x & y are true, v & z are false
• C、 w & y are true, v, x & z are false
• D、 w is true, v, x y and z are false

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