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模拟信号传输的基础是（），它是频率恒定的连续信号。

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焊接变位机工作台可带动工件绕工作台的旋转轴作（）的旋转。

A. 倾斜45°
B. 倾斜90°
C. 倾斜135°
D. 正反360°

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工会劳动保护工作方针是（）。

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You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE 5/24）; Which two statements are true？（）

A. SYSDATE should not be used with TIMESTAM
B. The database must have multiplexed redo log files.
C. The database must be in the MOUNT state to execute the command.
D. The database must be opened with the RESETLOGS option after the flashback operation.
E. The entire database needs to be restored from the most recent backup before the flashback operation.

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选用水泥的主要技术指标是（）。

A. 硬度
B. 坍落度
C. 强度
D. 体积安定性

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模拟信号传输的基础是（），它是频率恒定的连续信号。

焊接变位机工作台可带动工件绕工作台的旋转轴作（）的旋转。

工会劳动保护工作方针是（）。

You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE 5/24）; Which two statements are true？ （）

选用水泥的主要技术指标是（）。

You are working on an Oracle Database 10g database. Because of data loss， you decided to perform a Flashback Database operation using the following command： SQL> FLASHBACK DATABASE TO TIMESTAMP（SYSDATE 5/24）; Which two statements are true？（）