题目内容
电力拖动系统的负载特性是指生产机械的负载转矩与（）的关系。
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You are a network administrator for your company. The design team provides you with the following list of requirements for server disaster recovery： No more than two sets of tapes can be used to restore to the previous day. A full backup of each server must be stored off-site. A full backup of each server that is no more than one week old must be available on-site. Backups must never run during business hours. Tapes may be recalled from off-site storage only if the on-site tapes are corrupted or damaged. A full backup of all servers requires approximately 24 hours. Backing up all files that change during one week requires approximately 4 hours. Business hours for the company are Monday through Friday， from 6：00 A.M. to 10：00 P.M. You need to provide a backup rotation plan that meets the design team’s requirements. Which two actions should you include in your plan？（）
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