IDEF方法是美国空军针对计算机辅助制造工程项目中用于进行复杂系统分析和设计的方法，是在结构化分析方法基础上提出来的，其中对IDEFO描述不正确的是(3)。

(64)

(63)

(62)

(61)

(59)

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

(57)

(58)

(56)

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 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.