Your Oracle Database 10g is online when you execute the following statement: SQL>ALTER TABLESPACE MY_TABLESPACE FLASHBACK OFF; What is the result of executing this statement if the Flashback Database feature is already enabled in the database?()
A. The database does not record flashback logs for MY_TABLESPACE
B. The tables residing in MY_TABLESPACE are not protected by the Recycle Bin.
C. All the tablespaces except MY_TABLESPACE can be recovered using Flashback Database feature.
D. None of the flashback technologies, such as Flashback Table, Flashback Transaction Query and Flashback Version Query can be used to recover individual rows within the objects from MY_TABLESPACE
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某站有尽端式加冰线一条,有效长160m,以14.3m为单位计算,其容车数为()辆。
A. 11
B. 10
C. 12
D. 9
绝缘子在通常情况下,总是有微弱的泄漏电流,经绝缘体流向大地。
A. 正确
B. 错误
建筑石膏最突出的技术性质是凝结硬化快,且在硬化时体积略有膨胀。
A. 正确
B. 错误
患者40岁,女性。2年前心情不畅,某晚睡眠过程中突然大叫一声,双眼上翻,四肢强直,伴咬舌,尿失禁,呼之不应,5~6分钟后清醒。醒后自觉头痛,全身疼痛。2年内有3次类似发作,平时还常有短时间的发愣伴咀嚼吞咽动作,持续数分钟,事后不能回忆。最可能的诊断是()
A. 癔症发作
B. 强直-阵挛性发作
C. 复杂部分性发作继发全面性发作
D. 失神发作
E. 晕厥