LEAP认证过程中，AP仅仅担任（）的角色。

A、屏蔽网络流量

B、转发通道

C、质询信息

D、反向认证

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.

请叙述蓄电池组容量测试必须遵循的基本原则。

View the Exhibit and examine the attributes of an undo tablespace. In an OLTP system, the user SCOTT hasstarted a query on a large table in the peak transactional hour that performs bulk inserts. The query runs formore than 15 minutes and then SCOTT receives the following error:ORA-01555: snapshot too old What could be the reason for this error（）

A、 The query is unable to get a read-consistent image.

B、 There is not enough space in Flash Recovery Area.

C、 There is not enough free space in the flashback archive.

D、 The query is unable to place data blocks in undo tablespace

《维规》规定便携电台的音频输出功率≥（）W.

A、0.5

B、1

C、1.5

半双工操作是指电路的一端用（），另一端用双工操作的一种工作方式。