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国际市场公共关系

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什么叫层流、紊流？

What does the output on this report indicate？（） RMAN> report need backup； RMAN retention policy will be applied to the command RMAN retention policy is set to redundancy 1 Report of files with less than 1 redundant backups File #bkps Name 5 0 C：\ORACLE\ORADATA\ORCL\MY_DATA_01.DBF

A. The my_data_01.dbf datafile is corrupted and needs to be restored.
B. The my_data_01.dbf datafile has not yet been backed up. This report does not imply that the data in the datafile can not be recovered.
C. The my_data_01.dbf datafile has not yet been backed up. This report implies that the data in the datafile can not be recovered.
D. The my_data_01.dbf datafile no longer meets the retention criteria for backups.
E. Datafile 5 is missing.

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当电源掉电时，计算器保持原计数状态

A. 正确
B. 错误

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影响膜质流动性的因素是磷脂分子脂肪酸链的不饱和程度。不饱和程度越高，流动性越（），其原因是（）

A. 小，双键多，曲折小
B. 小，分子排列疏松
C. 大，双键多.曲折多
D. 大，分子排列疏松以上均不正确

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