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MTC过程是根据paging消息知道主叫号码的

A. 正确
B. 错误

You need to maintain a record of all transactions on some tables for at least three years. Automatic undo management is enabled for the database.What must you do accomplish this task?()

A. Enable supplemental logging for the database.
B. Specify undo retention guarantee for the database
Create Flashback Data Archive in the tablespace where the tables are stored.
D. Create Flashback Data Archive and enable Flashback Data Archive for specific table

有一位同学在学习凸透镜成像规律后,对光学产生了浓厚的兴趣,特意买了一块放大镜带回家探究,老师提示:千万不要拿放大镜对着太阳看,请画图并分析,这种做法可能产生什么危害?

热退火酸洗线退火炉全长()m。

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