[单选]

Exhibit
You work as a database administrator for Supportcenter.cn. While creating a new user or changing the password for existing users， the password must adhere to the restrictions specified in the exhibit. Which option would you use to achieve this objective？（）

You executed the following command in the Recovery Manager （RMAN）：   RMAN> REPORT NEED BACKUP days 3；   What is the output of this command？（）    A list of files that require a backup within 3 days。  A list of files requiring more than 3 days of archivelogs to apply。  A list of files that RMAN recommends be backed up only once in every three days，based on low volatility。  A list of files for which a backup as already been performed in the last three days and which is  required to be backed up again based on the high number of transactions performed on them。 功率因数又称为力率，可以理解为全部电流中有多大成分是作为（）输出的。 You have enabled resumable space allocation in your database by setting the RESUMABLE_TIMEOUTparameter set to a nonzero value.Which three statements about resumable space allocation are true? （）(Choose three.) Even with resumable space allocation enabled for your database, you can disable resumable space allocation for a single session.。 A resumable statement is suspended only if an out of space error occurs.。 When a resumable statement is suspended, the transaction that contains the statement is also suspended.。 A resumable statement can only be suspended and resumed once during the execution of the statement.。 You can query the V$SESSION_WAIT dynamic performance view to identify the statements that are suspended for a sessio。 设计在50赫兹电源上运行的三相异步电动机现改为在电压相同频率为60赫兹的电网上运行，其电动机的（）。 Tst减少，Tmax不变。 Tst减小，Tmax增大。 Tst增大，Tmax增大。 Tst减小，Tmax减小。 化工设备装配图中，螺栓联接可简化画图，其中所用的符号可以是（）。 细实线+。 细实线x。 粗实线+。 粗实线x。

Exhibit
You work as a database administrator for Supportcenter.cn. While creating a new user or changing the password for existing users， the password must adhere to the restrictions specified in the exhibit. Which option would you use to achieve this objective？（）