接地网：由（）接地体在地下相互连通构成，为电气设备或金属结构提供基准电位和对地泄放电流的通道。 一组。 多组。 双组。 一组或多组。
You notice a performance change in your production Oracle database and you want to know which change has made this performance difference. You generate the Compare Period Automatic Database Diagnostic Monitor (ADDM) report to further investigation. Which three findings would you get from the report?（） It detects any configuration change that caused a performance difference in both time periods.。 It identifies any workload change that caused a performance difference in both time periods.。 It detects the top wait events causing performance degradation.。 It shows the resource usage for CPU, memory, and I/O in both time periods.。 It shows the difference in the size of memory pools in both time periods.。 It gives information about statistics collection in both time periods.。
温度压力是影响爆炸极限的因素，当温度和压力增加时爆炸下限会（） 降低。 不变。 增大。
什么是复原重置成本？什么是更新重置成本？
你如何理解OpenDialog（打开文件对话框）和SaveDialog（保存文件对话框）这两个组件的基本功能？它们负责文件的打开和保存吗？
电压互感器二次回路三相失压，必须停用（）。
