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接地保护应可靠，导线间和导线对地间的绝缘电阻应大于（）。

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我国客货车的标准车钩高度是（）mm。

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计算机内存使用的类型主要是（）存取存储器和（）逻辑器件。

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企业的核心价值观决定了一个企业的行为趋向和价值判断标准。

A. 正确
B. 错误

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Your database operates in ARCHIVELOG mode. Usermanaged consistent backups are performed every Sunday night. On Tuesday， client A drops a table at 8：00 a.m. as follows： SQL> DROP TABLE cust_ord PURGE; Table dropped. Client B executes a query at 9：00 a.m. on the same table as follows： SQL> SELECT * FROM cust_ord; SELECT * FROM cust_ord * ERROR at line 1： ORA00942： table or view does not exist Client B needs the dropped table and reports the problem to you. With reference to this scenario， which action should you take？（）

A. retrieve the table by using the flashback feature
B. restore all the data files from last Sunday’s backup， and then perform a timebased recovery
C. restore all the data files from last Sunday’s backup， and then perform a log sequence recovery
D. restore all the data files from last Sunday’s backup， and then perform a cancelbased recovery
E. restore from last Sunday’s backup only data files that belong to the tablespace in which the table was stored， and then perform a complete recovery

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