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水利工程建设监理人员资格管理实行行业自律管理制度。

A. 正确
B. 错误

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由于承包人原因造成的不合理超挖部分监理人应予计量。

A. 正确
B. 错误

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Which two statements are true about a bitmap index？（）

A. It is recommended for the columns that have unique values.
B. It can be converted to a B-tree index by using the ALTER INDEX command.
C. It has a bitmap segment for each distinct value in the key column， containing a string of bits in which each bit represents the presence or absence of a key column value.
D. Updating the key column locks the whole bitmap segment that contains the bit for the key value to be updated.

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