题目内容

掺镨光纤放大器的工作波长为()nm波段。

A. 1300
B. 1500
C. 1700
D. 1900

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政治研究的科学化进程遇到的难题是()。

A. 隐性价值问题
B. 价值中立问题
C. 经费问题
D. 数据问题

我国历史上有两位最著名的女书法家她们是谁?

后配股在转为普通股之前,不能获得股利。

A. 正确
B. 错误

The SCOTT user has an index on the ITEM_DESC column of the ITEM table. As part of the year-ending task, SCOTT updates the ITEM_DESC column for most of the rows in the ITEM table. How does this change to the table affect the index?()

An update in a leaf row takes place.
B. The index becomes invalid after the update.
C. The leaf block containing the row to be updated is marked as invalid.
D. A row in the leaf block of the index for the key value is deleted and inserted.

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