除质量和老化的原因外,导致CRT显示器故障的主要因素有()。
A. 磁场干扰
B. 潮湿影响
C. 灰尘太多
D. 调节不当
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The network administrator needs to address seven LANs. RIP version 1 is the only routing protocol in use on the network and subnet 0 is not being used. What is the maximum number of usable IP addresses that can be supported on each LAN if the organization is using one class C address block?()
A. 8
B. 6
C. 30
D. 32
E. 14
F. 16
驾驶舱语音和飞行记录保持时间为:()
A. 60天
B. 90天
C. 30天