转K4型橡胶弹性下旁承尼龙摩擦板破损或顶面磨耗大于（）时须更换。
国际上建设工程领域信息技术（IT）的应用已经体现出了（）等特点。
A. 标准化
B. 集成化
C. 自动化
D. 虚拟化
E. 网络化
A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these ports?（）
A. Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port security mac-address command.
B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command.
C. Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them.
D. Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.
伯利克里曾在演说中这样说道：“任何人（雅典公民），只要他能够对国家有所贡献，绝对不会因为贫穷而在政治上湮没无闻。”为此他采取的改革措施是（）。
A. 废除债务奴隶制
B. 财产等级制
C. 津贴制
D. 比例代表制
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