输入输出设备就是计算机系统与外界交换信息所用的设备，输入设备有（）。
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ZPW-2000A型无绝缘移频自动闭塞的接收器在正常状态下其小轨道电路工作值力（）。
A. 25mV
B. 33.3mV
C. 45mV
D. 60mV
使用SERV---U搭建FTP服务器时，“将用户锁定于主目录”是什么意思？
Which three statements best describe HSRP configuration on Cisco Nexus switches？（）
A. In a vPC topology， the primary HSRP router will respond to ARP requests， but both HSRP routers will forward data traffic. No additional configuration is required.
B. In a vPC topology， the primary HSRP router will respond to ARP requests， but both HSRP routers will forward data traffic if the peer-gateway feature is enabled.
C. You can configure two overlapping HSRP groups to load share traffic from the connected hosts while providing the default router redundancy.
D. You can use the show standby command to verify HSRP operation and configuration.
E. If you remove the feature hsrp command， all relevant HSRP configuration information isalso removed.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
A. The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings
B. After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustment
C. During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearing
D. After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error
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