题目内容

队列研究中最容易发生的偏倚是()

A. 诊断怀疑偏倚
B. 报告偏倚
C. 回忆偏倚
D. 混杂偏倚
E. 失访偏倚

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试述压力机喘振的预防及防止喘振的方法?

利用专用夹具加工零件,既可保证质量又可提高生产率,但成本较高。

A. 正确
B. 错误

In your test database, you find that a user’s session is executing a lot of SQL statements, resulting in the generation of a large number of trace files. While investigating the reason, you find that SQL trace has been enabled at the instance level. You want to disable SQL trace, remotely, only for that user session to reduce the volume of trace data being generated. How do you achieve this objective?()

A. by setting the SQL_TRACE parameter to FALSE in the parameter file
B. by using DBMS_MONITOSESSION_TRACE_DISABLE to disable the tracing for the user session
C. by setting the SQL_TRACE parameter to FALSE by using the ALTER SYSTEM command in the user session
D. by setting the SQL_TRACE parameter to FALSE by using the ALTER SESSION command in the user sessio

()操作,不能退出PowerPoint演示文稿窗口。

A. 选择“文件”菜单中的“退出”命令
B. 用鼠标左键单击窗口右上角的“关闭”按钮
C. 按Alt+F4键
D. 按Esc键

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