A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（） [" network"," application"," session"," data link"]
几种接地保护的含义？
结束中文Windows98操作时，（）的说法是错误的。 ["可以直接关闭电源","可以在“开始”按钮中选“关闭系统”，选“关闭计算机”","可以在“开始”按钮中选“关闭系统”，选“重新启动计算机”","可以在“开始”按钮中选“关闭系统”，选“将计算机转入睡眠状态&rdquo"]
Which type of security will allow businesses to focus on achieving business goals？（） ["point-product security","endpointsecurity","network infrastructure security","secure access and threat defense"]
影响作业能力的因素有哪些？
比较本票、汇票、支票之间的异同？
