搜题请搜索小程序“爱下问搜题”
问题 单项选择题

当关键率CR＜1.0时，意味着 ( )

A．作业进度较计划提前

B．作业进度晚于计划

C．作业进度与计划同步

D．无法确定

答案

参考答案：B

解析：当关键率CR＜1.0时，意味着作业进度晚于计划。

填空题

用“珍”字组词填在括号里，不能重复。 

1．我们十分(    )我们之间的友谊。 

2．博物馆里陈列了许多艺术(    )。  

3．你给我最(    )的礼物——真诚的友情，我将永远(    )。

4．我们要(    )青春年华，努力学习，刻苦锻炼。

5．我校百花园里有几棵小松树，植物兴趣小组的同学们都十分(    )。
查看答案
单项选择题

A glue that holds the whole Internet together is the network layer protocol, ___35___. Unlike most older network layer protocols, it was designed from the beginning with internet working in mind. Its job is to provide a-___36___ way to transport datagrams from source to destination, without regard to whether these machines are on the same network or whether there are other networks in between them.

Communication in the Internet works as follows. The ___37___.layer takes data streams and breaks them up into datagrams. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. When all the pieces finally get to the destination machine, they are reassembled by the ___38___ layer into the original datagram. This datagram is then handed to the transport layer, which inserts it into the receiving process input stream.

An IP datagram consists of a header part and a text part. The header has ___39___ part and a variable length optional part.

37（）

A.data link 

B.transport 

C.network 

D.Application
查看答案