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).

（73）处填（）。

A．services

B．processes

C．applications

D．address

下列不符合必须停止原油洗舱作业的条件是：（）

A、油舱中含氧量超过了规定值

B、惰性气体系统发生故障

C、卸油港要求暂停原油洗舱作业

D、油舱内的气压为正值