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问题 单项选择题

通信子网一般由OSI参考模型的 (12) 。

A．低三层组成
B．高三层组成
C．中间三层组成
D．以上都不对

答案

参考答案：A

解析： 本题考查的是OSI参考模型的知识，需要对7层模型具有一定程度的理解。
在OSI模型的7层中，物理层、数据链路层、网络层属于通信子网；传输层、会话层、表示层、应用层属于资源子网。

改错题

改错。

( ) 1. Although I am new here, I have used to living here.                                                         

                  A                                           B       C

( ) 2. If I won the jackpot on a game show, I would divide the money to three.                           

                    A                    B                                                            C 

( ) 3. "Where are you going for vacation? Have you planed it out?"                                             

                                      A              B                         C

( ) 4. All consumers should be aware of their right of choose.                                                    

                        A                          B                      C

( ) 5. The sleeve is torn. It needs to be sew.                                                                             

                      A         B                          C

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问答题 简答题

为什么塑料零件必须进行表面处理？
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