The UNDO_RETENTION parameter in your database is set to 1000 and undo retention is not guaranteed. Which statement regarding retention of undo data is correct？（） Undo data becomes obsolete after 1，000 seconds.。 Undo data gets refreshed after every 1，000 seconds.。 Undo data will be stored permanently after 1，000 seconds.。 Committed undo data would be retained for 1，000 seconds if free undo space is available.。 Undo data will be retained in the UNDO tablespace for 1，000 seconds，then it gets moved to the TEMPORARY tablespace to provide read consistency.。
管道试压时，穿跨越二级以上公路管段应单独试压，强度试验压力为设计压力的（）倍。 1.1。 1.25。 1.5。 2.5。
增大风量时，应开大送风机的入口挡板。
以下属于按照配送中心的作业内容划分的配送中心类型是（） 集约型配送中心。 储存型配送中心。 流通型配送中心。 加工型配送中心。
In a Java EE messaging application, one MDB is consuming a lot of memory at high traffic. What configuration should you use to prevent possible out-of-memory error at high traffic and at the same time not losing messages?（） Configure a Work Manager for the MDB with a Maximum Thread Constraint.。 Configure a Work Manager for the MDB with a Minimum Thread Constraint. 。 Configure a Work Manager for the MDB with a Maximum Thread Constraint and a Capacity Constraint. 。 Configure a Work Manager for the MDB with a Minimum Thread Constraint and a Capacity Constraint. 。 Configure a Work Manager for the MDB with both a Maximum Thread Constraint and Minimum Thread Constraint.。
超文本标注语言的英文缩写是（）
