计算机网络分为广域网、局域网和城域网,其划分的主要依据是()
A. 网络的作用范围
B. 网络的拓扑结构
C. 网络的通信方式
D. 网络的传输介质
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以下不属于中间网络设备的是（）
A. 服务器
B. 防火墙
C. 路由器
D. 交换机
Puer Tea was mentioned in the famous novel A Dream of Red Mansions in Han Dynasty.
Xu Xiake was a well-known travel writer and a _____ in Ming Dynasty.
A. artist
B. geographer
C. educator
D. officer
Coastal sand sculpture is also called the ______.
A. the quick decay sand sculpture
B. the man-made sculptures
C. the natural sand sculpture
D. the artistic sand sculpture
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