教师在教学中既要向学生传授文化科学基础知识，发展学生智力，又要对学生进行思想道德教育，做到既教书又育人。这一原则是（） ["科学性与教育性相结合原则","传授知识与发展智力相结合原则","思想性和方向性相结合原则","科学性与艺术性相结合原则"]
What does the DB_FLASHBACK_RETENTION_TARGET parameter configure?（） [" An upper limit on how far you can flash back the database, depending on the information in the redo logs"," An upper limit on how far you can flash back the database, depending on the information in the undo tablespace"," The amount of time for which the flashback data is to be kept in the flash recovery area, provided that there is enough space"," The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace, provided that there is enough space"]
餐厅摆台的基本要求是什么？
在“一带一路”建设中，（）是承保出口商在经营出口业务的过程中可能受到进口商破产、拖欠或进口国发生战争、暴乱等风险而遭受损失的一种信用风险 ["保证保险","出口信用保险","责任保险","运输保险"]
鲜奶消毒主要使用加热方法，为了尽可能保持鲜奶的营养成分，合适的加热温度应为（）。 ["80~60℃","60℃以下","100~80℃","100℃以上"]
急性毒性
