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【单选题】
OSI模型中 应用层的作用是()。A.
对源设备和目的设备之间流经的所有数据提供控制
B.
提供网络任意终端上应用程序之间的接口
C.
提供数据加密和转换
D.
提供数据分段
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【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
with
B.
around
C.
for
D.
at
【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
for
B.
to
C.
towards
D.
over
【简答题】听对话，选答案。 ( )1. A. To play volleyball. ( )2. A. Red. ( )3. A. $35. ( )4. A. ( )5. A. He has a headache. B. To play chess. B. Green. B. $45. B. B. He has sore eyes. C. To play tennis...
【简答题】选词填空 transport, cargo, propel, battery,monorail, coach, railcar, freight (1) A system for carrying people or goods from one place to another using vehicles,roads, etc. is called . (2) is a railway sys...
【简答题】选词填空 hard drive battery crafts surfing the Net memory prize sign typical electricity split 4. There are three people living there. They _________ ...
【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
when
B.
while
C.
just then
D.
at that time
【单选题】Professor Green, known to the world as a scientist, is not only absent-minded but short-sighted as well. His mind is always busy 41 scientific problems and seldom notices what is going on 42 him. On...
A.
to think
B.
thinking
C.
thinking about
D.
to think of
【单选题】A 66-year-old man has had cough and worsening shortness of breath for 3 years On examination, there is dullness to percussion at both lung bases and poorly audible breath sounds. On physical examinati...
A.
Atrial myxoma
B.
Essential hypertension
C.
Hyperlipidemia
D.
Rheumatic fever
E.
Smoking
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