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【简答题】
设信道上数据传输速率为4Kbps，信道的传播时延为20ms，采用停等协议，帧的控制信息、确认帧长及帧处理时间均忽略不计，若信道的利用率为50%。试求出数据帧的长度。
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举一反三
【简答题】A．Visiting the capital of Salt Lake City. B．Visiting the Temple Square. C．Hiking through national parks. D．Hiking remote Indian reservations.
【单选题】Jim _____ his grandparents last Saturday. [ ]
A.
visited
B.
was visiting
C.
visits
D.
is visiting
【单选题】You have your lunch at schol,_____?
A.
have you
B.
hanen't you
C.
dou you
D.
don't ou
【简答题】一个书包内装有5本不同的小说,另一书包内装有6本不同学科的教材,从两个书包中任取一本书共有_______种取法.
【单选题】______ the home for the elderly ______ your kindness to the old. [ ]
A.
Visiting; show
B.
Visiting; shows
C.
To visit; show
D.
Visit; shows
【简答题】公元前 世纪,佛教在印度产生,其创立者是 。
【单选题】What is the man's sister doing now?
A.
She is visiting London.
B.
She is visiting New York.
C.
She is visiting Shanghai.
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