题目内容

下面不是光功率计的作用的是()。

A. 测量光功率的大小
B. 测量线路损耗
C. 测量系统富裕度
D. 向光纤内发射激光

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仪表稳压器不能使输出电压保持稳定。

A. 正确
B. 错误

其高者,因而越之

IP报文的第三个字段是()

A. 版本号
B. 长度
C. 服务类型
D. 协议

You lost the PRODSTD tablespace, which was read/write. The tablespace was read­only when the last backup was performed. How would you recover the tablespace?()

A. restore the tablespace from the backup; there is no need to apply the redo information
B. restore the full database to recover the data up to the point when you performed the backup
C. restore the tablespace from the backup, and then perform a recovery using the backup control file
D. restore the tablespace from the backup, and then recover the tablespace; all the redo information from the point when the tablespace was made read/write is applied

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