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【单选题】
网络协议的主要要素是:A.
编码、控制信息、时序
B.
数据格式、编码、信号电平
C.
数据格式、控制信息、速度匹配
D.
语法、语义、时序
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【简答题】Researchers found that women are overcome by a burning desire to share gossip（流言蜚语）as soon as they hear it. They will typically tell the secret to at least one other person in 47 hours. Depending on w...
【单选题】Some researchers believe that there is no doubt ____ a cure for AIDS will be found.
A.
which
B.
what
C.
that
D.
whether
【简答题】阅读理解。 Researchers found that people become happier and experience less worry after they reach the age of fifty. In fact, they say by the age of eighty-five, people are happier with their life than the...
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