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抄表时应注意哪些事项？

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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.
B. After two days， the backup will be deleted from the media.
C. 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.
D. If the RMAN repository has records of two or more recent backups of a file， then the older backup will be marked obsolete.

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变压器室的大门一般按变压器外形尺寸加（）。

A. 0.5m
B. 0.6m
C. 0.7m
D. 0.8m

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气态制冷剂在冷凝器中的凝结液化过程是定温定压过程。

A. 正确
B. 错误

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维持学习和实际运用所学内容的能力会影响培训成果转化。

A. 正确
B. 错误

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