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均衡运价

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常见设计缺陷包括（）

A. 铆钉，螺栓或其他连接处
B. 连续焊接处
C. 圆边
D. 上列所有缺陷
E. 上列所有缺陷都不包括

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什么叫共模干扰，其抑制方法有哪些？

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You work as a database administrator for Certkiller .com. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？（）

A. 3 hours
B. 6 months
C. until last year
D. until last commit
E. until the point when the undotablespacewas refreshed
F. until the database is shut down and the memory erased

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用柴油清洗推铺机时，不得接近明火。

A. 正确
B. 错误

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均衡运价

常见设计缺陷包括（）

什么叫共模干扰，其抑制方法有哪些？

You work as a database administrator for Certkiller .com. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？ （）

用柴油清洗推铺机时，不得接近明火。

You work as a database administrator for Certkiller .com. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？（）