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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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生产经营单位在新建、扩建、改建和引进项目时，必须保证该项目的安全卫生设施与主体工程同时设计，同时施工，同时（）。

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出票银行在收到挂失止付通知书之前，已经向持票人付款的，出票银行应（）。

A. 承担责任
B. 不承担责任
C. 视情况而定
D. 根据法院裁定而承担责任

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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。

生产经营单位在新建、扩建、改建和引进项目时，必须保证该项目的安全卫生设施与主体工程同时设计，同时施工，同时（）。

出票银行在收到挂失止付通知书之前，已经向持票人付款的，出票银行应（）。

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？（）