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【判断题】
封闭环的公差等于各组成环的公差之差。A.
正确
B.
错误
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反馈参考答案：
举一反三
【多选题】DiffServ模型由下列哪些组件构成（）。
A.
DS域（Differentiated Service Domain）
B.
DS边界节点（DS Boundar Nodes）
C.
DS内部节点（DS Interior Nodes）
D.
边界链路和内部链路
E.
非DS域
F.
DS区（Differentiated Service Region）
【单选题】听力原文：The students performed the play written by George very well and got a good review in the college newspaper. (24)
A.
George starred the play and reviewed a lot before the performance.
B.
The performance was well received.
C.
The college newspaper wrote an excellent article about George.
D.
A journalist from the college newspaper interviewed the students.
【单选题】Which is not a 2-dimensional imperfection?
A.
Twin boundary
B.
Dislocation
C.
Surface
D.
Grain boundar y
【简答题】George was very (help) ______, we could not do the job without him.
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