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【单选题】
网络层提供的面向连接服务,在数据交换时:A.
必须先建立连接,在该连接上传输数据,数据传输完成后释放连接
B.
必须先建立连接,在该连接上只用于传输命令/响应,传输后释放连接
C.
不需要建立连接,传输数据所需要的资源动态分配
D.
不需要建立连接,传输数据所需要的资源事先保留
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反馈参考答案：
举一反三
【单选题】不使用捕捉工具时,骨骼能直接创建在下列哪种位置?( )
A.
透视图的 XY平面上
B.
透视图的 ZY平面上
C.
透视图的 ZX平面上
D.
透视图中经过原点的任意平面上
【简答题】What are the five layers in the Internet protocol stack? What are the principal responsibilities of each of these layers?
【单选题】It is proved that the Sun is divided into five layers.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】Where do these people live? Watch the interviews and match the names with the information. Video Track 1-6-1.wmv a. lives in a small house with four bedrooms. b. lives in a house in Mexico City. c. li...
【判断题】The five layers of the OSI reference model can be divided into two categories: upper layers and lower layers.
A.
正确
B.
错误
【单选题】Why does Jonathan like green?
A.
He lives in Washington State, it often rains there. So everything is green, the trees are green, the plants are green.
B.
No reason.
【多选题】What are five of the seven layers that are found in the OSI model?（）
A.
application
B.
protocol
C.
session
D.
transport
E.
physical
F.
gateway
G.
data link
【简答题】What are the five layers in the Internet protocol stack?
【简答题】Five layers of a linguistic structure are_______,_______,_______,_______, and sentence.
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