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。
Which Coherence caching pattern matches the sequence of events ？（） 1. Data is requested from cache 2. The requested data does not exist in the cache （cache miss） 3. The Coherence cache store is used to red data from the back-end persistent data source， and placed in ther cache 4. Data requested from the cache is returned to the caller read through。 write through。 refresh ahead。 write behind。
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？
简述轴与孔的热胀配合法。
下列变速箱，有超速档变速箱的是（）
