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问题 解答题
一块布，用去
1
5
米，还剩
4
5
．______．
答案

因为用去

1
5
米，这里的
1
5
米是具体的数量；而还剩的
4
5
，是剩下的分率，

所以一块布，用去

1
5
米，还剩
4
5
的说法是错误的．

故判断为：×．

单项选择题

TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines
(73) that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (74) 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 (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. iteration B. objectC. interface D. activity
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单项选择题

每个资源单元组（REG）包含（）个数据RE

A.1，

B.2，

C.3，

D.4.
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