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问题 选择题

已知过抛物线y2＝2px(p>0)的焦点F且垂直于抛物线的对称轴的直线交抛物线于A，B两点，若线段AB的长为8，则p的值为(　　)．

A．1

B．2

C．4

D．8

答案

答案：C

抛物线y2＝2px(p>0)的焦点为F，对称轴为x轴，过抛物线y2＝2px(p>0)的焦点F且垂直于对称轴的直线为x＝，交抛物线于A，B两点，线段AB的长为8，故2p＝8，得p＝4.

单项选择题

在营销计划与运营负荷的研究确定中，运营负荷的高低主要取决于（）。

A．市场

B．原材料供应

C．技术熟练程度

D．项目复杂程度
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单项选择题

The use of computer graphics (1) many diverse fields. Applications (2) from the production of charts and graphs, to the generation of realistic images for television and motion pictures to the (3) design of mechanical parts.To encompass all these uses, we can adopt a simple definition:Computer graphics is concerned with all (4) of using a computer to generate images.We can classify applications of computer graphics into four main areas:Display of information, Design, (5) ,User interfaces.

A．simulate

B．Simulation

C．simulator

D．simulacrum
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