In (66) the strength of the carrier 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 al 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．NAT

B．NCP

C．DDN

D．DNS

《GB50204-2002》对超过尺寸允许偏差且影响结构性能和安装、使用功能的部位，应由（）单位提出技术处理方案。

A、施工单位

B、设计单位

C、监理单位

D、建设单位