常用的庭荫树
You executed the following query in your database： SELECT oldest_flashback_scn， oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG； What would you determine from the output？（） [" The time when the last flashback operation in your database was performed."," The time when the first flashback operation in your database was performed."," A list of flashback operations performed in your database using SCN and time."," The approximate time and the lowest system change number （SCN） to which you can flash back your database."]
滑动轴承必须润滑，而滚动轴承由于磨损阻力小就不需要润滑。
张某，25岁，7d前干活时不慎右手食指末端被刺破，未经消毒处理，3d后感到肿胀，轻微疼痛，昨天开始疼痛加剧，以夜间为甚，难以人睡，局部苍白，肿胀明显，全身不适。如果治疗不及时，可能发生（） ["肌键坏死","手内肌坏死","掌中间隙感染","指骨坏死","手部蜂窝织炎"]
Click the Exhibit button. What is the output of the program shown in the exhibit？（） ["300-100-100-100-100","300-300-100-100-100","300-300-300-100-100","300-300-300-300-100"]
联系幼儿园实际分析贯彻学前儿童游戏教育实施的教育性原则必须遵循哪些基本要求？
