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目前从世界范围来看，使用最多的是（）的薪酬体系。

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Modem载波暂时丢失可以通过添加附加指令（）来解决这类问题。

You work as a database administrator at Certkiller .com. You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEEStable. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area. Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）

A. perform point-in-time recovery
B. perform a Flashback Table operation to restore the table to the state it was in two days ago
C. perform a Flashback Database operation to restore the database to the state it was in two days ago
D. perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery

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两个屈服准则有何差别？在什么状态下两个屈服准则相同？什么状态下差别最大？

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抹灰工程应分层施工，底层的作用是（），中层的作用是（），面层的作用是（）。

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