In your database， UNDO_RETENTION has been set to 600 sec and UNDO tablespace is configured for RETENTION GUARANTEE. Which statement regarding RETENTION GUARANTEE is true？ （） Undo data is retained until the next full database backup.。 No committed undo data will be overwritten for 10 minutes.。 Committed undo data will be kept forever if not overwritten within 600 seconds.。 Guarantees that requested undo information are available until the instance is shut down.。
商品劳务课税是对（）课征的税收。 所得额。 财产。 商品和劳务。 利息。
一个不能忽略电阻的线圈，与一个电容串联，电路发生谐振，则线圈两端电压Ul和电容两端电压Uc的关系是（）。 Ul>Uc。 Ul=Uc。 Ul。
检查油嘴时，先关哪个闸门（） 生产闸门。 回压闸门。 总闸门。
You creating a report that will run in both character mode and bitmapped environments. You include some printer codes in your report. What will happen when you run the report in bitmapped mode? （） The report will not execute. 。 The report will only accept destination type of previewer or printer. 。 Printer codes will be ignored. 。 Only the printer codes that apply will be processes.。
班级保教人员的言谈举止对幼儿具有极强的示范作用，这说明班级保教工作具有的特点是（）
