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【判断题】
在TCP/IP协议中,TCP提供可靠的面向连接服务,UDP提供简单的无连接服务,而电子邮件、文件传送协议等应用层服务是分别建立在TCP协议、UDP协议、TCP或UDP协议之上的。A.
正确
B.
错误
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【单选题】He has ____ to China for the summer.
A.
come out
B.
come up
C.
come over
D.
come across
【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 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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