You want to make use of the object features available in the database for the form module you are developing. Which three statements about object types are true? （） An object type is a user-defined composite data type. 。 The attributes of an object type can be those of other object types. 。 A PL/SQL table of records is an example of a nested object type. 。 An object type must be declared as a type before the actual object itself can be declared.。
往复式压缩机的活塞环在安装时，注意同组相邻活塞环周向开口应对齐。
简述角色游戏的基本结构。
Which two statements are TRUE regarding Coherence Indexes ？ （） indexes are maintained by cache entry ownes。 an application should not suggest an index that another aplication had suggested。 indexes cannot be sorted。 each application using Coherence may suggest the same set of indexes when it start。
税金包含营业税和（）。 A.所得税 。 B.城市维护建设税 。 C.教育费附加 。 D.地方教育附加。
下列属于英国1984年《数据保护法》规定了对数据用户“不透露”条件豁免的情况是（）
