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问题 单项选择题

设f(x)在(-∞，+∞)上连续，下述命题
①对任意

的充要条件是f(x)为奇函数．
②对任意

的充要条件是f(x)为偶函数．
③对任意

具有周期T的充要条件是f(x)具有周期T．
正确的个数是 ( )．

答案

参考答案：C

单项选择题

With the widespread use of the personal computer, many authorities in the field of (56) have pointed out the need for computer literacy.
Unfortunately, there is no (57) agreement as to what the term "computer literacy" means. Some feel that computer literacy means knowing how to make the computer "compute"; that is knowing how to program computers in one or more programming languages.
Others feel that knowing how to program is merely a small segment of computer literacy. These people (58) the major emphasis in schools should be on teaching how to effectively use the many software packages that are available.
Still others suggest that computer literacy education is not required. They suggest that computers are being so rapidly integrated into our society that using a computer will be as (59) as using a telephone or a video tape recorder, and that special education will not be necessary. (60) of one’s definition of computer literacy, it is recognized by most that learning to use a computer is indeed an important skill in modern society.

A．Importance

B．Instead

C．Because

D．Regardless
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单项选择题

通过局域网接入因特网，图中箭头所指的两个设备是（）

A．二层交换机

B．路由器

C．网桥

D．集线器
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