我国现行教育的“重中之重”是

A. 幼儿教育
B. 基础教育
C. 中等教育
D. 研究生教育

杂质半导体有__型和__型之分，PN结具有__特性。

三极管按结构类型分为__型和__型，按材料分为__管和__管，三极管是一种__放大器件。三极管要实现放大，需发射结__，集电结__。场效应管是一种__控制型器件

多级放大电路的电压放大倍数是各级电路电压放大倍数的__，输入电阻是__，输出电阻是__。

差动放大电路能够抑制__，大小相等、极性相同的信号称为__信号，大小相等、极性相反的信号称为__信号。

Fill in the blanks by selecting suitable words from the word bank. You may not use any of the words more than once.A attainB pursueC raiseD classifyE especiallyF fascinatingG availableH passionI acquireJ sampleK fulfillL qualifyM virtuallyN fashionableO prosperousUniversity students come from different parts of the country with various purposes. However, a closer look at their reasons for studying at the university will enable us to 1)___________them roughly into three groups: those who have a(n) 2)____________for learning, those who wish to 3) _________a bright future, and those who learn with no definite purpose.Firstly, there are many students who learn simply because they 4)___________their goal of learning. Some read a wealth of British and American novels because they are keenly interested in literature. Others sit in front of the computer screen, working on a new program, 5) _____________day and night, because they find some computer programs 6)______________, and they dream of becoming a "Bill Gates" one day.Secondly, there are students who work hard mainly for a better and more 7) ___________future. It seems that the majority of students fall into this group. After admission to the university, they read books after books to 8)____________knowledge from all of the resources which are 9)______________to them, and finally, to succeed in the future job market.Thirdly, there are still some students who learn without a clear goal. They take courses, finish homework, enjoy life on campus, but don't want to 10) ___________anything new or challenging. They have no idea what they will be doing after college. And they may end up with nothing in their lives.

选择图像之后,选择“编辑/自由变换”命令,在图像四周将自动显示出一个有( )个控制点的矩形框。

A. 9
B. 4
C. 6
D. 8

以下说法错误的是( )

A. 像素是组成矢量图形的基本单位
B. 图像分辨率的单位是像素每英寸
C. 显示器分辨率的单位是点每英寸
D. 个人计算机显示器的分辨率一般是96dpi

按( )键可在文字工具组内的各文字工具之间来回切换。

A. Ctrl+T
B Alt+T
C Shift+T
D T

对选区填充前景色的快捷键是( )

A. Ctrl+Delete
B. Alt+Delete
C. Shift+Delete
D. Ctrl+Shift+Del