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问题 多项选择题

细菌性肝脓肿常见的主要临床表现是

A．寒战、高热

B．黄疸

C．肝肿大，肝区疼痛

D．大量出汗，恶心呕吐，食欲缺乏，乏力

E．贫血

答案

参考答案：A,C,D

解析：黄疸和贫血在肝脓肿中可以出现，但是不是常见的症状。

选择题

“三个数a、b、c不都为0”的否定为（　　）

A．c不都是为0

B．c至多有一个为0

C．c至少有一个为0

D．c都为0
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单项选择题

A transport layer protocol usually has several responsibilities. One is to create a process-to-processcommunication UDP uses（1）numbers to accomplish this. Another responsibility is to provide controlmechanisms at the transport level, UDP does this task at a very minimal level. There is no flow control mechanismand there is no（2）for received packet. UDP, however, does provide error control to some extent. If UDPdetects an error in the received packet, it will silently drop it.

The transport layer also provides a connection mechanism for the processes. The （3）must be able to sendstreams of data to the transport layer. It is the responsibility of the transport layer at （4） station to make theconnection with the receiver chop the stream into transportable units, number them, and send them one by one. Itis the responsibility of the transport layer at the receiving end to wait until all the different units belonging to thesame process have arrived, check and pass those that are （5）free, and deliver them to the receiving process asa stream.

（3）是（）

A.jobs

B.processes

C.programs

D.users
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