The main disadvantage of wind power is that it______.
A. is competitive
B. produces more pollutants
C. is low in efficiency
D. is ugly
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A person who believes in his incompetence will ______.
A. make no real efforts
B. fail to go at a job
C. show a complete lack of confidence
D. all of the above
以太网中如果发生介质访问冲突，按照二进制指数后退算法决定下一次重发的时间，使用二进制指数后退算法的理由是（）。
A. 这种算法简单
B. 这种算法执行速度快
C. 这种算法考虑了网络负载对冲突的影响
D. 这种算法与网络的规模大小无关
如果路由器配置了BGP协议，要把网络地址133.1.2.0/24发布给邻居，那么发布这个公告的命令是（）。
A. R1 (config-router) #network 133.1.2.0
B. R1 (config-router) #network 133.1.2.0 0.0.0.255
C. R1 (config-router) #network-advertise 133.1.2.0
D. R1 (config-router) #network 133.1.2.0 mask 255.255.255.0
As a boy, Alfred Adler was poor at arithmetic because______.
A. he lost his self-confidence
B. he was mentally slow
C. his teacher had no confidence in herself
D. his parents expected too much of him
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