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试述压力机喘振的预防及防止喘振的方法?

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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

格兰仕借助欧美跨国公司向中国转移制造业,给对方贴牌生产微波炉产品,有六成产品贴国外品牌的商标,这种进入国际市场的途径是。()

A. 由出口商或进口商进行分销
B. 国内企业同外国企业进行营销系统的置换和共享
C. 中国企业自己在境外建立营销网络
D. OEM(贴牌生产)

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