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【简答题】
CSMA/CD工作过程中,发送分组的同时还要保持()。一旦信道冲突,实际应用中,要产生一个()信号来阻塞信道,防止其他节点没有检测到碰撞继续传输。
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【单选题】It’s necessary that not only ____to see a doctor but also stay at home for a good sleep. A. Bob should go B. did Bob go C. Bob’s going D. should Bob go
A.
B.
C.
D.
D
【单选题】It’s necessary that he ______ a recognized qualification. A. has B. have C. had D. having
A.
has
B.
have
C.
had
D.
having
【单选题】It’s necessary that _____ them to give us a hand.
A.
we asked
B.
we ask
C.
we will ask
D.
we asking
【单选题】In order to do something meaningful, it’s necessary that you _______ determine what is really important.
A.
must
B.
will
C.
need
D.
should
【简答题】It’s necessary that the president ________ in time to attend the meeting. A) came B) will come C) come D) comes
【单选题】It’s necessary that an efficient worker________his work on time.
A.
accomplishes
B.
accomplish
C.
can accomplish
D.
has accomplished
【单选题】why do people eat fish at spring festival?
A.
because it smeans “万事如意年年高”
B.
because we hope we can get more and more next year.
C.
because it looks like gold ingots.
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