搜题请搜索小程序“爱下问搜题”
问题 单项选择题

设f(x)是周期为2π的周期函数，它在[-π，π)上的表达式是，则将f(x)展开成傅里叶级数(ancosnx+bnsinnx)时，a0等于（）。

A．A

B．B

C．C

D．D

答案

参考答案：A

解析：

。

单项选择题

A narrowing of your work interests is implied in almost any transition from a study environment to managerial or professional work. In the humanities and social sciences you will at best reuse only a fraction of the material (1) in three or four years’ study. In most career paths academic knowledge only (2) a background to much more applied decision-making. Even with a " training " form of degree, (3) a few of the procedures or methods (4) in your studies are likely to be continuously relevant in your work. Partly this (5) the greater specialization of most work tasks compared (6) studying. Many graduates are not (7) with the variety involved in (8) from degree study in at least four or five subjects a year to very standardized job (9) . Academic work values (10) inventiveness, originality, and the cultivation of self-realization and self-development. Emphasis is placed (11) generating new ideas and knowledge, assembling (12) information to make a " rational " decision, appreciating basic (13) and theories, and getting involved in fundamental controversies and debates. The humanistic values of higher (14) encourages the feeling of being (15) in a process with a self-developmental rhythm. (16) , even if your employers pursue enlightened personnel development (17) and invest heavily in " human capital " —for example, by rotating graduate trainees to (18) their work experiences—you are still likely to notice and feel (19) about some major restrictions of your (20) and activities compared with a study environment.

10（）

A.unique

B.single

C.individual

D.specific
查看答案
多项选择题

刮板输送机司机接班时，需检查检查输送机的（）等是否完好，连接螺栓是否齐全、可靠。

A.电机

B.减速器

C.电缆

D.防护装置
查看答案