位于贵池地区的齐山保存了200多处摩崖石刻，遍山皆存。石刻中，年代可考的，保存最多的是（)时期的石

创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类是Person，正确的命令是

A．CREATE CLASS mylib OF student As Pemon

B．CREATE CLASS student OF Pe~on As mylib

C．CREATE CLASS student 0F mylib As Pe~on

D．CREATE CLASS Person OF mylib As student

创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类是Person，正确的命令是

A．CREATE CLASS mylib OF student As Pemon

B．CREATE CLASS student OF Pe~on As mylib

C．CREATE CLASS student 0F mylib As Pe~on

D．CREATE CLASS Person OF mylib As student

A.CREATE CLASS mylib OF student AS Pcrson

B.CREATE CLASS student OF Person AS mylib

C.CREATE CLASS student OF mylib AS Person

D.CREATE CLASS Person OF mylib AS student

A.CREATE CLASS mylib OF student AS Pcrson

B.CREATE CLASS student OF Person AS mylib

C.CREATE CLASS student OF mylib AS Person

D.CREATE CLASS Person OF mylib AS student

A.CREATE CLASS mylib OF myteacher AS Teacher

B.CREATE CLASS myteacher OF Teacher AS mylib

C.CREATE CLASS myteacher OF mylib AS Teacher

D.CREATE CLASS Teacher OF mylib AS myteacher

A. CREATE CLASS mylib OF myteacher AS Teacher

B. CREATE CLASS myteacher OF Teacher AS mylib

C. CREATE CLASS myteacher OF mylib AS Teacher

D. CREATE CLASS Teacher OF mylib AS myteacher

已建立一个名为teacher的类，保存该类的类库名称是mylib，则删除该类正确的命令是（）。

A)REMOVE CLASS mylib OF teacher

B)REMOVE CLASS teacher OF mylib

C)DELETE CLASS mylib OF teacher

D)DELETE CLASS teacher OF rnylib

已建立一个名为teacher的类，保存该类的类库名称是mylib，则删除该类正确的命令是（）。

A)REMOVE CLASS mylib OF teacher

B)REMOVE CLASS teacher OF mylib

C)DELETE CLASS mylib OF teacher

D)DELETE CLASS teacher OF rnylib