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简述什么是发展性评价?

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铣齿的齿顶削平度在软地层为加快钻速宽度要小些;在硬地层为保证强度宽度要大些。

A. 正确
B. 错误

刻度为有效值的电压表只能正确测量正弦电压的大小,而不能测量非正弦电压的大小。

A. 正确
B. 错误

在应急救援过程中生产经营单位物资供应部门负责抢险抢救物质的供应和保障等工作。

A. 正确
B. 错误

You are maintaining your database in Oracle10g. You set the value of the UNDO_RETENTION initialization parameter to zero in the initialization parameter file. What will be the impact of specifying this setting?()

A. The database will not start.
B. The database will start but will not retain the undo data in the undo segment.
C. The database will start, and the undo segment will contain the undo data for at least one hour.
D. The database will start, and the undo segment will retain the undo data for at least 15 minutes.

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