题目内容

串并联消防泵有（）控制两只叶轮实现“并联”或“串联”工作。

A. 止回阀
B. 换向阀
C. 引水阀
D. 出水阀

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建设银行手机银行转账汇款功能可以部分满足客户的各类转账汇款需求。

A. 正确
B. 错误

（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。

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（）。