题目内容

蝙蝠在夜间也能发现飞舞着的蚊虫。主要依靠（）

A. 蚊虫发出的叫声
B. 蝙蝠发出的叫声
C. 蚊虫散发的热量
D. 蚊虫散发的激素

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On Monday， you dropped the DEPT table from your schema and then you re-created the DEPT table in your schema. On Wednesday， you have a requirement to restore the DEPT table from the recycle bin. Which statement is correct？（）

A. You can restore the DEPT table by using the Oracle Flashback Drop feature， provided you use the RENAME TO clause.
B. You can restore the DEPT table by using the Oracle Flashback Drop feature and a system-generated name will be assigned to the restored table.
C. You cannot restore the DEPT table by using the Oracle Flashback Drop feature because a table with the name DEPT already exists in your schema.
D. You cannot restore the DEPT table by using the Oracle Flashback Drop feature because the contents of the recycle bin are purged every 12 hours by default.

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