Which of the following is NOT true about advertising?
A.Advertising does not always increase sales.
B.Advertising serves to relay information from buyers to producers.
C.Advertising is and will continue to be a necessary part of everyday life.
D.It is suggested that advertising should be abolished.
第6题
A.IP地址由网络地址和主机地址两部分组成
B. E类地址用于IP组播
C. C类地址供小型网络使用,每一个C类网络中主机个数最多为255台
D. D类地址用于IP组播
第7题
A.每个C类网络可以包含255台主机
B.C类地址一般分配给小型局域网使用
C.C类地址的IP范围是192.0.0.0~224.255.255.255
D.C类IP地址允许有221_2个不同的C类网络
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