根据房地产价格单位的不同，将房地产的价格划分为：（）、（）、（）。 ["总价格","单位价格","楼面地价","土地价格"]
You are installing Oracle Database 11g on your server. During the installation Oracle Universal Installer （OUI） prompts you to enter the path of the inventory directory and also prompts you to specify an operating systemgroup name. Which statement is true in this case（） ["The ORACLE_BASE parameter is not set.","The installation is being performed by the root user.","The operating system group that will be specified should have root user as its member.","The installation is being performed without the "Create Starter Database" option selected.","The operating system group that will be specified must have permission to write to the inventory directory"]
如果某三相异步电动机的极数为4级，同步转速为1800转/分，那么所接三相电源的频率为（）。 ["A、50赫兹 ","B、45赫兹 ","C、60赫兹 ","D、30赫兹"]
简述微生物的主要特征。
If you back up a database without connecting to the recovery catalog， which operations will cause the recovery catalog to be updated？（） [" The next time you back up the database when you are also connected to the recovery catalog and the target database"," The next time you are connected to the target database and the recovery catalog database and issue the resync command"," The next time you connect RMAN to just the recovery catalog"," The next time you connect to the recovery catalog and the target database with RMAN"," Connecting to the recovery catalog and issuing the resync all databases command"]
持球突破技术主要是由（）、（）、（）、（）、（）五个技术环节组成。持球突破技术动作是由（跨）、（）、（）、（）四个环节组成。
