患儿，男，5岁，因"体检发现心脏杂音一周"入院。查体：无紫绀，胸骨左缘第二肋间可闻及粗糙的连续性机器样杂音，向锁骨下窝传导。

经超声心动图检查此患儿为动脉导管未闭，可能的病理解剖类型包括（）

A.管状

B.漏斗状

C.缩窄型

D.螺旋状

E.窗状

F.条索状

(1) In the strength of the carrier signal is varied to represent binary 1 or 0.

(2) is a system that can map a name to an address and conversely an address to an name.

(3) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol

(4) is an approach that enables an ATM Switch to behave like a LAN switch.

(5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

4（）

A．VLAN

B．LANE

C．VPN

D．IPOA