What is the output of this command?（）
A list of files that require a backup within 3 days
B. A list of files requiring more than 3 days of archivelogs to apply
C. A list of files that RMAN recommends be backed up only once in every three days, based on low volatility
D. 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
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The pitch of a propeller is a measure of the（）.
A. angle that the propeller makes with a free stream of water
B. angle that the propeller makes with the surface of the water
C. number of feet per revolution the propeller is designed to advance in still water without slip
D. positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without sli
存放疫苗的冰箱每日（包括节假日）应测温（）次
A. 全天一次
B. 上午一次
C. 下午一次
D. 上、下午各一次，间隔6小时
E. 上、中、下午各一次，共三次
机械万用表测量电阻量前必须对电容进行充分放电。
A. 正确
B. 错误
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