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（1）适用于小型网站，（2）适用于中小型网站，（3、4、5）适用于大型网站。

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You are maintaining the SALES database of a company. You have never backed up the USERS tablespace that is currently offline. On Sunday， you issued the following commands： CONFIGURE DEFAULT DEVICE TYPE TO sbt； CONFIGURE BACKUP OPTIMIZATION ON； CONFIGURE RETENTION POLICY TO REDUNDANCY 3； From Monday to Saturday， you performed the following actions： Day Action Monday BACKUP DATABASE Tuesday BACKUP DATABASE Wednesday BACKUP DATABASE Thursday BACKUP DATABASE Friday BACKUP DATABASE Saturday BACKUP DATABASE How many times will the backup of the USERS tablespace be performed？（）

A. The backup will not be performed at all.
B. three times
C. four times
D. six time

交流说的基本论点，即图书馆学应研究图书馆在科学交流和情报传递中的（）。

HS合成低温液压油是以合成烃为基础油的液压油，有比HV液压油更（）的低温粘度。

面向胶带运行方向，当胶带向（）跑偏时，可将托辊左端向前摆或将右端向后摆。

A. 左
B. 右
C. 前
D. 后