【名词&注释】
可行性研究(feasibility study)、肺动脉(pulmonary artery)、集体心理治疗(group psychotherapy)、精神分析(psychoanalysis)、经常性(usualness)、气密性试验(air tight test)、右心室(right ventricle)、人工呼吸机(biomotor)、工程全寿命费用、交付使用(initiation into service)
[单选题]A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocol is to create a (2) and error-control mechanism at the transport level. TCP uses a sliding (3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve (4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.
A. B