属于沟通技巧中"参与"的做法是（）

A.在交谈中适当点头

B.表达自己的观点

C.对事情作出自己的判断

D.问病人"换句话说，您是想……"

E.迅速向病人作保证

In (66) the strength of the carder signal is varied to represent binary 1 or 0. (67) is a system that can map a name to an address and conversely an address to an name. (68) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol. (69) is an approach that enables an ATM Switch to behave like a LAN switch. (70) is an guided media which is made of glass or plastic and transmits signals in the form of light.

A．VLAN

B．LANE

C．VPN

D．IPOA