废水处理中变异现象有哪几方面？
在验收工作中进一步落实水利工程建设项目法人责任制，强调（）以及其他参建单位应当提交真实、完整的验收资料，并对提交的资料负责。 监理人。 投标人。 项目法人。 以上都不对。
You need to perform a block media recovery on the tools01.dbf data file in the SALES database by using Recovery Manager (RMAN). Which two are the prerequisites to perform this operation? （）(Choose two) You must configure block change tracking file。 You must have first level 1 backups for RMAN to restore blocks。 You must ensure that the SALES database is mounted or open。 You must have full or level 0 backups for RMAN to restore blocks。 You must take the tools01.dbf data file offline before you start a block media recovery。
You performed the RMAN database backup with the KEEP option.Which two statements are true about this backup?（） (Choose two) The KEEP option overrides the configured retention policy。 The KEEP option is an attribute of an individual backup piece。 The backup contains only data files and archived redo log files。 The backup contains data files, the server parameter file and the control file even if the control file auto backup is disabled。
节流板用于测定：（） 液位。 流量。 压力。
哪些互动属于发布管理的职责（）
