目前常见的网络攻击活动隐藏不包括下列哪一种（）。
A、网络流量隐藏
B、网络连接隐藏
C、进程活动隐藏
D、目录文件隐藏
Which of the following printers would be the BEST choice for printing on multi-part forms?（）
A、Impact printer
B、Thermal printer
C、Inkjet printer
D、Laser printer
Which two statements are true regarding B-tree indexs（）
AThe leaf blocks in the index are doubly linked.
BThe leaf node stores a bitmap for each key value.
CThe rows with NULL value in key columns also have entries in the index.
DThe deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry
某公司采用100M宽带接入Internet，公司内部有15台PC机，要求都能够上网。另外有2台服务器对外分别提供Web和E-mail服务，采用防火墙接入公网，拓扑结构如下图所示。如果防火墙采用NAPT技术，则该单位至少需要申请（）个可用的公网地址。
A、1
B、2
C、3
D、4
Which of the following customer requirements is the TS7650G Gateway designed to address?（）
A、latency across a long distance network
B、high-speed backup of large video files
C、improve the throughput of tape backups
D、reduce cost and increase storage capacity utilization
CPU中，除了内部总线和必要的寄存器外，主要的两大部件分别是运算器和（ ）。
A、控制器
B、存储器
C、Cache
D、编辑器