税收法律关系是指通过（）规范确认和调整的，国家、税务机关和税务管理相对人之间在税务活动中发生的具有权利义务内容的社会关系。 宪法。 刑法。 民法。 税法。
You work as a database administrator for Supportcenter.cn. One of the database users accidentally deleted all the rows of a critical table and committed the delete at 1：30 p.m. You senior database administrator， SupportCenter， asks you to retrieve the lost data. Which two actions would you use to ensure that there is no impact on other connected users while retrieving the deleted rows？（） Use a flashback query to retrieve the rows that were deleted。 Useconventialincremental export and then import the affected object。 Shutdown the database inNORMALmode and restart the database instance。 Use DBMS_META package to reconstruct the object using undo segments。 UseTablespacePoint in Time Recovery （TSPITR） method to recover the table and the data。 Use Oracle DataPumptwithflashback_timeoption toentableflashback export and then import the affected object.。
You executed the following query： SELECT operation， undo_sql， table_name FROM flashback_transaction_query； Which statement is correct regarding the query output？（） It would return information regarding only the last committed transaction.。 It would return only the active transactions in all the undo segments in the database.。 It would return only the committed transactions in all the undo segments in the database.。 It would return both active and committed transactions in all the undo segments in the database.。 It would return information regarding the transactions that began and were committed in the last 30 minutes.。
试举例分析小企业管理包含的内容。
在非常情况下，监理机构可以先通过电话或口头传递工程文件内容要点，并在随后的（）内补传书面正式文件。 A.4小时 。 B.8小时 。 C.24小时 。 D.72小时。
计算机网络的基本功能是哪些（）
