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【简答题】
拓扑结构中,中央节点负担重,容易成为网络的(__),一旦出现故障造成整个网络瘫痪;
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举一反三
【简答题】TCP/IP 体系结构 分为四层,他们从低到高分别是( )、( )、( )、( )。
【简答题】 Listen to the following short dialogues and choose the appropriate answers.
【简答题】 Listen to the story and choose the right answers to the questions you hear.
【简答题】 Listen to the speech / talk again and choose the right answer.
【单选题】 Listen and choose the most proper responses to the questions you hear.
A.
Yes, his father is a doctor.
B.
No, this is not a factory.
C.
No, he works in that one.