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问题 单项选择题

以下关于LDP描述不正确的是（）。

A.MPLS使用LDP来完成标签的分配、控制和保持

B.运行了LDP协议的两台LSR之间会建立LDP Session并交换Label/FEC映射消息

C.建立了LDP Session的两台路由器称为LDP Peers

D.LDP消息承载在UDP和TCP之上，端口号为64

答案

参考答案：D

填空题

用所给单词的适当形式填空。

1. The flood _____(wash) him away. His mother _____(cry) sadly.

2. The weather report says it _____(rain) tomorrow.

3. It's _____(snow). Please close the window.

4. —What _____ you _____ when the earthquake started?

    —I was cleaning the house.

5. It _____(rain) heavily outside. You'd better _____(stay) at home.

6. I hear Mr White _____ (give) us a report on earthquake in a week, isn’t he?

7. Bob didn't know where _____(go) , so he had to stay at home.

8. The weather today is fine but it _____(be) cloudy soon.

9. —Why _____ you _____ (look) so nervous?

    —Because I'm afraid of _____(answer) questions before the whole class.

10. Don't get off the bus before it _____(stop).
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问答题 简答题

哪些煤可作炼焦配煤？
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