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问题 单项选择题 A1/A2型题

慢性阻塞性肺疾病急性发作最常见的原因是（）

A.治疗不规律

B.空气污染

C.感染

D.过敏

E.气候变化

答案

参考答案：C

解析：感染是慢性阻塞性肺疾病急性发病的常见原因，所以治疗时也应首先注意感染的治疗。

填空题

计算：（-2）2-1=______．
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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.

38（）

A.data link 

B.Transport 

C.network 

D.Application
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