题目内容

当抽油井井口装有无线回压传感器时，RTU中L8状态指示灯闪烁或50s亮灭一次表示（）传感器井口回压有数据接收。

A. 无线载荷
B. 无线死点开关
C. 无线温度
D. 无线压力

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In which scenario will you use the Flashback Version Query feature？（）

A. when you want to restore a table that has been dropped from the Recycle Bin
B. when you want to identify the transaction ID of the transaction that deleted some important records from a table
C. when you want to recover the schema of a dropped user
D. when you want to restore a dropped tablespace

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