You are creating tablespaces in Oracle. Which of the following keywords or clauses permits the datafiles of a database to grow automatically in order to accommodate data growth?（） ["DEFAULT STORAGE ","EXTENT MANAGEMENT ","AUTOEXTEND ","DATAFILE"]
在什么情况下应用化学浸出，有哪些浸出方法？
职权与任职者的个人特性有关。
集权和分权是一个相对的概念。
关于交流电动机调速方法正确的是（） ["变频调速","改变磁通调速","改变转子电压","定子串电阻调速"]
语言符号在应用中是以（）排列的。
