You are administering a database stored in Automatic Storage Management (ASM). You use RMAN to back up the database and the MD_BACKUP command to back up the ASM metadata regularly. You lost an ASM disk group DG1 due to hardware failure. In which three ways can you re-create the lost disk group and restore the data?（） Use the MD_RESTORE command to restore metadata for an existing disk group by passing the existing disk group name as an input parameter and use RMAN to restore the data.。 Use the MKDG command to restore the disk group with the same configuration as the backed-up disk group and data on the disk group.。 Use the MD_RESTORE command to restore the disk group with the changed disk group specification, failure group specification, name, and other attributes and use RMAN to restore the data.。 Use the MKDG command to restore the disk group with the same configuration as the backed-up disk group name and same set of disks and failure group configuration, and use RMAN to restore the data.。 Use the MD_RESTORE command to restore both the metadata and data for the failed disk group.。 Use the MKDG command to add a new disk group DG1 with the same or different specifications for failure group and other attributes and use RMAN to restore the data.。
When installing the CRS software on two or more nodes in the same cluster, how do you know it is safe to start installing the next node? （） Wait until the node is completely installed to start installation on the next one. 。 After you insert Disk 2. 。 A dialog box, "It is now safe to start installing the next node," appears during the installation. 。 After Windows OS is installed on the first node.。
基站的馈线接地排宜采用截面积不小于（）铜板、孔数20个的铜排，铜排的安装应与基站室外走线架隔离。 100mmx10mm。 100mmx40mm。 60mmx10mm。 100mmx20mm。
绿色革命
一台离心泵扬程50CM，氧化氢如果用来输送密度为0.73的轻和输送1.0的水，哪个扬程高（） 输送水比输送油高。 输送油比输送水高。 一样高。
药物滥用是指（）
