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我国历史上有两位最著名的女书法家她们是谁？

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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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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

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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

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