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 （） to the IP layer.A TCP （） accepts user data streams from local process, breaks them into pieces not exceeding 64KB, and sends each piece as a separate IP （） . When datagrams containing TCP data 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 （） them as need be. Datagrams do arrive may well do so in the wrong order, it is also up to TCP to （） them into messages in the proper sequence.

A TCP （） accepts user data streams from local process.

A．connection

B．file

C．entity

D．destination

政府价格决策听证，是指制定或调整实行政府指导价或者政府定价的重要商品和服务价格前，由政府价格主管部门组织社会有关方面，对制定价格的( )进行论证。

A．具体价格标准
B．必要性、可行性
C．程序
D．科学性、合理性