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问题 单项选择题

以下网络协议中，哪些协议属于数据链路层协议______。 Ⅰ．TCP Ⅱ．UDP Ⅲ．IP Ⅳ．SMTP

A．Ⅰ、Ⅱ和Ⅲ

B．Ⅰ和Ⅱ

C．Ⅲ和Ⅳ

D．都不是

答案

参考答案：D

解析： TCP和UDP都是属于传输层的协议；IP是网络层的协议；SMTP是应用层的协议。

选择题

-- What’s your name, please?    --- _____name is Gina Smith.

A．I

B．Your

C．My

D．Me
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单项选择题

(31) analysis emphasizes the drawing of pictorial system models to document and validate both existing and/or proposed systems. Ultimately, the system models become the (32) for designing and constructing an improved system. (33) is such a technique. The emphasis in this technique is process-centered. Systems analysts draw a series of process models called (34) . (35) is another such technique that integrates data and process concerns into constructs called objects.

（33）是（）

A. Structured analysis

B. Information Engineering

C. Discovery Prototyping

D. Object-Oriented analysis
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