加油站模拟核算的一般流程是收集数据、计算各经济指标、编制报表、分析报表并提出建议。

Each machine supporting TCP has a TCP transport entity, either a library procedure, a user process, or part of the kernel. In all case, it manages TCP streams and (1) to the IP layer. A TCP (2) Accepts user date streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP (3) .When datagrams containing TCP date arrive at a machine, they are given to the TCP entity, which reconstructs the original byte streams.
The IP layer gives no guarantee that datagrams will be delivered properly, so it is up to TCP to time out and (4) them as need be. Datagrams do arrive may well do so in the wrong order, it is also up to TCP to (5) them into messages in the proper sequence.

A．connection

B．file

C．entity

D．destination