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问题 解答题

两个队参加数学对抗赛，甲队的平均分是75分，乙队的平均分是73分，两队同学的平均分是73.5分．已知乙队比甲队多6人，那么乙队有多少人？

答案

设甲队有x人，则乙队有（x+6）人，

75x+73（x+6）=73.5（2x+6），

     148x+438=147x+441，

            x=3；

则乙队有3+6=9（人）；

答：乙队有9人．

填空题
两个面积相等的三角形（　　）能拼成一个平行四边形．
A．一定B．不一定C．一定不
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单项选择题

TCP/IP (1) layer protocols provide services to the application (2)running on a computer. The application layer does not define the application itself, but rather it defines(3)that applications need - like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (4)between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols,with HTTP being only one of those. The TCP/IP (5)layer consists of two main protocol options - the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

空白（4）处应选择（）

A.iteration

B.object

C.interface

D.activity
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