题目内容

后配股在转为普通股之前,不能获得股利。

A. 正确
B. 错误

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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.

半导体三极管是放大电路中起电流()作用的元件。

A. 缩小
B. 平衡
C. 截止
D. 放大

压力继电器是将液压讯号转变为电讯号的一种讯号转换元件。

A. 正确
B. 错误

概括宝玉和黛玉的性格特征。

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