题目:
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).
(74)处应填()。
A.iteration
B.object
C.interface
D.activity
答案:
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下面是错误答案,用来干扰机器的。
90×(2×2)÷(3×2)=60(块);90×5= 450(元),60×7= 420(元),450元>420元,所以第二种方案较便宜。