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问题 单项选择题

TCP/IP参考模型可以分为4个层次：应用层、传输层、互连层与( )。

A．网络层

B．主机-网络层

C．物理层

D．数据链路层

答案

参考答案：B

解析： TCP/IP参考模型可以分为4个层次：应用层、传输层、互连层、主机-网络层。

单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

In what year was Edward born ？（）
(1) In 1988, Edward turned 17 years old.
(2) Edward’s sister Lisa, who is 14 months older than Edward, was born in 1970.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.
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单项选择题

函数的定义域为（）。

A．(1，2)∪(2，4)

B．[1，2)∪(2，4)

C．(1，2)∪(2，4]

D．[1，2)∪(2，4]
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