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问题 单项选择题

从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性：（）.

A.A

B.B

C.C

D.D

答案

参考答案：C

解析：

观察可知，第一个图与第三个图关于第二个图对称，第二个图与第四个图关于第三个图对称。

问答题 简答题

试说明影响防腐剂防腐作用的因素。
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单项选择题

A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port （1） to accomplish this. Anotherresponsibility of a transport layer protocol is to create a（2）and error-control mechanism atthe transport level. TCP uses a sliding（3）protocol to achieve flow control. It uses theacknowledgment packet, time-out, and retransmission to achieve （4） control. The transportlayer is also responsible for providing a connection mechanism for the application program. Theapplication program sends （5）of data to the transport layer. It is the responsibility of thetransport layer at the sending station to make a connection with the receiver.

（2）是（）

A.procedure

B.function

C.route

D.flow
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