试题与答案

在TCP工作过程中,当发送方连续发送多个报文后等待接收应答报文时,如果其中部分报文出

题型:单项选择题

题目:

在TCP工作过程中,当发送方连续发送多个报文后等待接收应答报文时,如果其中部分报文出错或丢失,则其对应的解决方法是()。

A.设置计时器,计时满后发送相应的探测报文

B.发送某个字节后将后续的字节缓存直到原来的字节被确认

C.在窗口更新尺寸变得大于某一合理值之前不通知对方进行窗口更新

D.建立TCP连接时使用TCP首部的“选择性确认”可选项

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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某新建商业用房的总投资为2500万元,开发项目的总面积为15000m2,预计3年后建成,从投资开始到投资全部收回的预期年限为13年。建筑投资为2000元/m2,该商业用房的销售价格为4000元/m2,周边同档次物业的价格水平为3500元/m2,预计该物业的利润为800万元。

确定该商业用房均价后,制订用于销售的价目表应包括的内容有()。

A.景观情况

B.套面积

C.楼栋号

D.单价

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题型:完形填空

第三部分 情景对话  根据对话内容从题后选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。(5分 每小题1 分)

__The class will be over, Any questions?

_________56_______

__For today’s homework, you should do the exercise on page 10.

_______57______

__First write them down in your exercise books, and then practice them orally until you have learned all of them by heart.

__________58_________

__ I won’t ask you to hand in your exercise books until the day after tomorrow. Can you manage to recite them next week? I think you have plenty of time.

__________59_________

__ OK. If you have any questions, come to my office tomorrow. I’ll be available from 1:30 to 5:30.

__ Thank you very much._____________60_______

__ You are welcome.

A.Shall we do it orally or write out the exercise in our exercise books?

B.It is difficult for us to finish so much work in such a short time .

C.Mr. Gao, what’s today’s homework?

D.Well, we’ll try to finish the homework in time .E.We’ll go if we have any questions.

F.It will take us a lot of time.

G.We’re wasting too much time.

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