（）为达到与地连接的目的，一根或一组与土壤（大地）密切接触并提供与土壤（大地）之间的电气连接的导体。 接地体。 接地线。 接地条。 接地管。
Examine the parameter for your database instance: You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan: Identify the reason why the optimizer chose different execution plans.（） The optimizer used a dynamic plan for the query.。 The optimizer chose different plans because automatic dynamic sampling was enabled.。 The optimizer used re-optimization cardinality feedback for the query.。 The optimizer chose different plan because extended statistics were created for the columns used.。
低压封堵作业中，液动挡板在使用后要清洗，活塞杆和两根导向轴的表面及其它配合表面涂上（），保持清洁与润滑。 润滑脂。 二硫化钼。 黄甘油。 黄油。
What characteristics make ADSL the likely choice among DSL technologies for Teleworker?（） most widely deployed by service providers 。 provides asymmetrical bandwidth, including high speed downlink。 data rate is affected by distance to the Central Office。 provides the furthest reach at T1 speeds 。 supports connection of two routers without the use of a DSL access concentrator。
Which two statements are true about Shared SQL Area and Private SQL Area（） Shared SQL Area will be allocated in the shared pool.。 Shared SQL Area will be allocated when a session starts.。 Shared SQL Area will be allocated in the large pool always.。 Private SQL Area will be allocated in the Program Global Area （PGA） always.。 Shared SQL Area and Private SQL Area will be allocated in the PGA or large pool.。 The number of Private SQL Area allocations is dependent on the OPEN_CURSORS parameter.。
You were recently hired by Certkiller .com as a database administrator. You are asked to find out whether the currently functional listener process， named L1， has been password protected or not. You are not familiar with the file system of the new organization. How would you accomplish the task？（）
