男，16岁，胸骨左缘3、4肋间闻及响亮的收缩期杂音，震耳，伴有震颤，但听诊器离开胸壁听不到。

该患者治疗首选（）

A.房间隔缺损修补

B.结扎动脉导管

C.洋地黄强心治疗

D.室间隔缺损修补

E.利尿剂

A socket is basically an end point of a communication link between two applications. Sockets that extend over a network connect two or more applications running oncomputers attached to the network. A sockettwo addresses:. Sockets provide acommunication channel between one or more systems.
There aresockets separately using TCP and UDP.

A．full-duplex

B．half-duplex

C．simplex

D．complex