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【简答题】
UDP的首部格式依次包括以下字段:源端口(2字节)、目的端口(2字节)、长度(2字节)、检验和(2字节)。有一个UDP首部如下:0050 DB34 0038 03AC。请问:源端口号是 ,目的端口号是 ,数据长度是 字节。这个报从 到 方向的。 客户进程是 (MAIL/FTP/SNMP/TELNET/HTTP/QQ/DNS/DHCP)
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举一反三
【单选题】The end sentence of the article is to ______.
A.
emphasize the importance of love
B.
explain how people love each other
C.
show why lovers exchange rings
D.
tell a story of rings in the universe
【单选题】The author's intention in writing the article is to make Americans realize that ______.
A.
it is dangerous to ignore their foreign friends
B.
it is important to maintain their leading role in world affairs
C.
it is necessary to use several languages in public places
D.
it is time to get acquainted with other cultures
【简答题】The purpose of the article is to explain_________
【单选题】The purpose of the article is to draw public attention ______ the problem.
A.
to
B.
on
C.
in
D.
for
【单选题】The aim of the article is to _____.
A.
show how to use smart cards.
B.
show the difference between ATM card and chip card.
C.
how the smart cards have become popular.
D.
persuade Americans to use smart cards.
【单选题】The purpose of the article is to tell us ______.
A.
the effect of antibiotics
B.
not to use antibiotics unless necessary
C.
that antibiotics are harmfull
D.
that our natural defence systems are superior to antibiotics
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