A technician notices that there is a second partition on the primary hard drive. This partitionis notassigned a drive letter and is not accessible from Windows. Which of the following is the MOST likely explanation for this extra partition?（）

A、Space reserved by the drive manufacturer for firmware.

B、Space set aside by Windows for use by the virtual memory swap file.

C、A potentially dangerous virus has been downloaded onto the system.

D、A recovery partition put there by the manufacturer.

You have performed the first step in placing your database into ARCHIVELOG mode. The second step is deciding whether the online redo log files are to be archived automatically or manually.  Which action should you take to enable archiving at instance startup？（）

A、 A

B、 B

C、 C

D、 D

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 Person

B、CREATE CLASS student OF Person As mylib

C、CREATE CLASS student OF mylib As Person

D、CREATE CLASS Person OF mylib As student

Windows XP mode on a Windows 7 Professional machine fails to load. Which of the following isMOST likely the cause?（）

A、The machine does not have enough processor cores to allow for this feature.

B、Virtualization support is not enabled in the BIOS.

C、A license of Windows XP must be purchased in order to use Windows XP Mode.

D、The machine does not have enough RAM to allow for this feature.

数据流图用于抽象描述一个软件的逻辑模型，数据流图由一些特定的图符构成。下列图符名标识的图符不属于数据流图合法图符的是（　　）。

A、控制流

B、加工

C、存储文件

D、源和潭

AutoCAD中，对象的阵列有哪几种方式（）。

A、环形

B、圆形

C、线形

D、矩形