日本东京证券交易所与伦敦证券交易所合作设立了TOKYOAIM创业板市场，东京证券交易所为保护个人投资者的利益，特别规定了较高的准入门槛，仅允许净资产或金融资产在3亿日元以上，并有（）年以上交易经验的投资者参与交易。

A．4

B．3

C．2

D．1

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 HTTE 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．application

B．session

C．physical

D．transport