【单选题】
在下面给出的协议中，_______是TCP/IP的应用层协议。___
A. TCP和FTP
B. DNS和SMTP
C. RARP和DNS
D. IP和UDP
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答案
B
解析
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在下面对OSI参考模型的数据链路层的功能特性描述中，哪一项是不正确的？___
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【单选题】
下面属于TCP/IP协议族中网络互联层协议的是___。
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Having practiced so many times, I feel very ___ of my ability to deliver the presentation successfully.
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Smart phones – with cameras and color screens – can ___ images and data using wireless network technology.
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___ they have written about the behaviors of animals is hardly anything new.
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