作业工具如板手、螺丝刀等等都应做()(避免带电操作以避免误碰电源正负极引起火花而影响设备运行和人生安全) 保养。 绝缘处理。 除锈。 接地。
You issue the following RMAN command to set a retention policy on a database: RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2; What will be the outcome of the above command?() After two days, the backup will be marked obsolete.。 After two days, the backup will be deleted from the media.。 If the RMAN repository has records of two or more recent backups of a file, then the older backup will be deleted from the media.。 If the RMAN repository has records of two or more recent backups of a file, then the older backup will be marked obsolete.。
如果变压器进水受潮,油的气相色谱中,唯有一种气体的含量偏高,这种气体是()。 乙炔C2H2。 甲烷CH4。 氢气H2。
工业用液化石油气瓶的颜色标记为()。 瓶为银灰;。 瓶色为棕色;。 字色为大红;。 字色为白色。
Click the Exhibit button. What is the output of the program shown in the exhibit? () 300-300-100-100-100。 300-300-300-100-100。 300-300-300-300-100。 300-100-100-100-100。
What are the consequences of executing the SHUTDOWN ABORT command? ()