可动心轨型辙叉主要用于普通列车运行的线路上的道岔。
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要全面了解学生的心理健康状况，应选用的测验是（）
A. 瑞文测验
B. 症状自评量表
C. 卡特尔16因素个性测验
D. 渐进矩形测验
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.
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