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。
《维规》规定便携电台的音频输出功率≥（）W.
A、0.5
B、1
C、1.5
请叙述蓄电池组容量测试必须遵循的基本原则。
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.
下列攻击手段中，基于网络的入侵防护系统无法阻断的是（ ）。
A、SYNFlooding
B、SQL注入
C、DDOS
D、PingofDeath
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.