一个对象是由属性、方法和事件所组成。属性表示对象中的数据，（）是对象能够执行的动作，（）是能够引起对象反应的条件。
活塞移动能达到的最上端位置称为（），此时活塞距离曲轴的旋转中心（）。
Which statement is true regarding virtual private catalogs？（） A virtual private catalog owner can create a local stored script， and have read/write access to a global stored script.。 The virtual private catalog owner cannot create and modify the stored scripts.。 The set of views and synonyms that make up the virtual private catalog is stored in the schema of the RMAN recovery catalog owner.。 To perform most of the RMAN operations， the virtual catalog owner must have the SYSDBA or SYSOPER privilege on the target database.。
Click the Exhibit button. Which three statements are true？（） Compilation fails.。 The code compiles and the output is 2.。 If lines 16， 17 and 18 were removed， compilation would fail.。 If lines 24， 25 and 26 were removed， compilation would fail.。 If lines 16， 17 and 18 were removed， the code would compile and the output would be 2.。 If lines 24， 25 and 26 were removed， the code would compile and the output would be 1.。
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You configured the flash recovery area in the database. Which two files would you expect to find in the flash recovery area？（）
