题目内容

个不是百度站内搜索获得收入自定义广告的尺寸()

A. 300*250
B. 500*200
C. 300*300

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晶体膜电极具有很高的选择性,这是因为晶体膜只让特定离子穿透而形成一定的电位。

A. 正确
B. 错误

开放式基金应当保持足够的()或者政府债券,以备支付基金份额持有人的赎回款项。

A. 现金
B. 股票
C. 权证
D. 期货

网点楼盘位置选择,建筑内部结构应为钢结构或混凝土框架结构,大开间,采光良好,层高大于()米可做夹层较好。

A. 7
B. 6
C. 5
D. 4

You want to track and store all transactional changes to a table over its lifetime. To accomplish this task, you enabled Flashback Data Archive with the retention of 5 years. After some time, the business requirement changed and you are asked to change the retention period from 5 years to 3 years. To accomplish this, you issued the following command: ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEARS; What is the outcome of this command?()

A. The command produces an error because the retention period cannot be reduced
B. All historical data older than 3 years is purged from the flashback archive FLA1
C. All historical data is retained but the subsequent flashback data archives are maintained for only 3 years
D. All historical data is transferred to flashback logs and the flashback archive is refreshed to set a new retention time

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