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清上丸功效与作用

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清上泻火汤功效与作用

You require the Oracle server to manage the undo segments and space among various active sessions automatically. You created an undo tablespace, UNDO_TBS1, in your database. Which two additional steps would you perform to achieve this?()

A. Set the UNDO_RETENTION parameter to 900 or more.
B. Create an initial undo segment in the undo tablespace.
C. Enable the retention guarantee for the undo tablespace.
D. Set the UNDO_TABLESPACE parameter to UNDO_TBS1.
E. Set the UNDO_MANAGEMENT initialization parameter to AUT

检测室门窗打开空气流通情况下,在硫化氢检测箱内检测硫化氢传感器时,可以不开检测箱的排风扇进行检测吗?有何危害?

电压比校核,试验变压器的高压输出端应串接保护电阻器,保护电阻的取值一般为0.1Ω/V~0.5Ω/V,阻值不宜超过30kΩ并应有足够的()。

A. 比热
B. 热容量
C. 长度
D. 宽度

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