群植（树群）
You executed the following command to drop a user： DROP USER scott CASCADE； Which two statements regarding the above command are correct？（） All the objects of scott are moved to the Recycle Bin.。 Any objects in the Recycle Bin belonging to scott are purged.。 All the objects owned by scott are permanently dropped from the database.。 All the objects of scott in the Recycle Bin must be purged before executing the DROP command.。 Any objects in the Recycle Bin belonging to scott will not be affected by the above DROP command.。
实体性贬值
硅酸盐的结构特点
角色扮演的方法有助于维持选择平衡，使人们较为全面地评估选择的方案的优点与缺点，防止片面化。（）
关键词广告就是（）
