TCP service is obtained by having both the sender and the receiver create end points, which are called

A．network address

B．supernet address

C．socket

D．IP address

患者男，30岁，突发腹痛2小时，持续性剧烈疼，伴有恶心、呕吐，查体可见腹部膨隆，右下腹压痛、反跳痛伴肌紧张，听诊未闻及肠鸣音，腹部平片可见孤立肠袢，首先考虑的诊断为（）

A.肠套叠

B.肠扭转

C.机械性肠梗阻

D.绞窄性肠梗阻

E.动力性肠梗阻