论述防止汽蚀现象的措施。
Your database supports an online transaction processing (OLTP) application. The application is undergoing some major schema changes, such as addition of new indexes and materialized views. You want to check the impact of these changes on workload performance. What should you use to achieve this?（） Database replay。 SQL Tuning Advisor。 SQL Access Advisor。 SQL Performance Analyzer。 Automatic Workload Repository compare report。
从材料角度区分，能判断儿童是否正在游戏的一个指标是（） 玩具的逼真程度。 有无许多玩具。 有无玩具或游戏材料。 玩具的贵贱。
为防止瓶内介质因升温超压发生事故而设置的可拆卸的、由（）作为动作部件的熔化泄放型气瓶安全附件，简称易熔塞。 易熔合金。 不易熔合金。 木块。 铅封。
Which two statements are true when when a Coherence cluster member is lost ？ （） Remaining members recover by repartitioning the data across the remainig cluster members in parallel with normal request processing。 Some latencies may be experienced due to higher priority of recovery。 In flight operations may be lost。 A system administrator must manually assist recovery of the lost data。
在JZZC-3型综合重合闸装置中，有N，M，Q，R各跳闸点，经N点跳闸的保护为（）。
