问题
单项选择题
基于UDP的应用层协议是（）。
A.SMTP
B.TELNET
C.HTTP
D.TFTP
答案
参考答案：D
解析：
基于UDP的应用层协议主要有RPC、SNMP、TFTP等。基于TCP的应用层协议主要有TELNET、FTP、SMTP、HTTP等。
搜题请搜索小程序“爱下问搜题”
基于UDP的应用层协议是（）。
A.SMTP
B.TELNET
C.HTTP
D.TFTP
参考答案：D
解析：
基于UDP的应用层协议主要有RPC、SNMP、TFTP等。基于TCP的应用层协议主要有TELNET、FTP、SMTP、HTTP等。
I stood there listening to my father shout at top of his voice. The 1 on his face said that one of us had done something wrong. “ 2 one of you did this? ” We all stared down at the step. There was child’s handwriting in chalk there. I was very 3 . I hoped no one could see it. Would he guess it was me? I was so scared. When he asked me, I 4 , “Not me, Dad. ” The others denied (否认) it as well. Of course, we all knew that one of us 5 have done it. But as the 6 and the smallest of the three, I just couldn’t find the courage to tell the 7 . To find out who had written on the 8 , father gave us each a piece of paper and a pencil. “I want each of you to 9 exactly what you see on the step. ” I tried my best to write the words 10 . I didn’t want Dad to be able to tell it was me. He gathered up our pieces of paper and looked at them. “ Since 11 of you will admit(承认) to have done it, then I will punish you all. ” I stood there and said 12 . The last thing I wanted was for Dad to punish me! “ I 13 it. ” My sister stepped forward and said she had done something she hadn’t. She was punished for a month. We didn’t talk 14 that day for many years. Not until we were all older and I knew it was safe to finally tell my dad it was really me. I always felt sorry 15 it. That was the last time I let anyone take the blame for me.
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