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【单选题】
若数据链路层采用回退N（go-back-N）滑动窗口协议，发送帧的序号用7bit表示，发送窗口的最大值为（ ）。A.
64
B.
127
C.
128
D.
7
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举一反三
【简答题】Who _______ (dance) the best in your class?
【单选题】－－ The organizer didn’t make ________ clear who would be the winner of the competition. －－ He di
A.
13. -- The organizer didn’t make ________ clear who would be the winner of the competition. -- He did. Whoever __________ to the top of the mountain will win. A．this / make that
B.
it / makes it
C.
that / to make it
D.
it / making it
【单选题】—Who is Linda? —She is ______ one of the two girls under the tree. [ ]
A.
taller
B.
tallest
C.
the taller
D.
the tallest
【单选题】Either of them can take this job，but I wonder who does everything _________ ．A． the
A.
13． Either of them can take this job，but I wonder who does everything _________ ． A． the most careful
B.
more carefu
C.
most carefully
D.
more carefully
【单选题】There are on my desk.
A.
three paper
B.
three pieces of papers
C.
three pieces of paper
D.
three papers
【单选题】Who is not expected to pay the bill when someone's birthday is celebrated?
A.
The friends who come to celebrate the birthday.
B.
The person whose birthday it is.
C.
The person's parents.
D.
The person's boyfriends or girlfriends.
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