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问题 单项选择题

对上市证券认识错误的一项是( )。

A．上市证券又称挂牌证券

B．开放式基金价额属于上市证券

C．具有在交易所内公开买卖的资格

D．上市须由公司提出申请，经证券监管机构或证券交易所依法审核同意，并与证券交易所签订上市协议

答案

参考答案：B

单项选择题

在DMA传送方式下，外部设备与存储器之间的数据传送通路是( )。

A．数据总线DB

B．专用数据通路

C．地址总线AB

D．控制总线CB
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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．application

B．session

C．physical

D．transport
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