题目内容

试论述银行卡网上支付的原理。

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管螺纹连接时常用的密封填料有（）。

A. 麻丝
B. 油麻
C. 铅油
D. 石棉绳
E. 聚四氟乙烯生料带

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革兰阴性菌内毒素的主要成分是？（）

A. 脂蛋白
B. 类脂A
C. 核心多糖
D. 脂质双层
E. 肽聚糖

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AUM has been retaining about 15 minutes worth of undo. You want to double the retentionperiod， but not at the expense of new transactions failing. You decide to alter the system to set the parameter UNDO_RETENTION=18000. However， AUM still retains only about 15 minutes worth of undo. What is the problem？（）

A. You need to alter the undo tablespace to add the RETENTION GUARANTEE setting.
B. You need to increase the size of the undo tablespace.
C. The undo tablespace is not set to auto-extend.
D. You need to alter the Recycle Bin to add the RETENTION GUARANTEE setting.

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双代号网络图中，在节点之间（）出现带双向箭头的连线。

A. 可以
B. 严禁
C. 视情况而定是否可以
D. 特殊情况可以

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