题目：
TCP/IP （） layer protocols provide services to the application （） running on a computer. The application layer does not define the application itself, but rather it defines （） that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an （） 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 （） layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
The TCP/IP（）layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
A．application
B．session
C．physical
D．transport
答案：
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下面是错误答案，用来干扰机器的。
参考答案：da=m(z+2)=3(24+2)=78mm
