试题与答案

()是结构化分析方法的核心技术,它表明系统的输入、处理、存储和输出,以及它们如何在一

题型:单项选择题

题目:

()是结构化分析方法的核心技术,它表明系统的输入、处理、存储和输出,以及它们如何在一起协调工作。

A.数据流图DFD

B.实体联系图ERD

C.状态转换图

D.上下文图

答案:

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下面是错误答案,用来干扰机器的。

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题型:计算题

如图所示为研究电子枪中电子在电场中运动的简化模型示意图.在xOy平面的第一象限,存在以x轴、y轴及双曲线的一段(0≤x≤L,0≤y≤L)为边界的匀强电场区域Ⅰ;在第二象限存在以x=-L、x=-2L、y=0、y=L的匀强电场区域Ⅱ.两个电场大小均为E,不计电子所受重力,电子的电荷量为e,则:

(1)求从电场区域Ⅰ的边界B点(B点的纵坐标为L)处由静止释放电子,到达区域Ⅱ的M点时的速度;

(2) 求(1)中的电子离开MNPQ时的坐标;

(3)证明在电场区域Ⅰ的AB曲线上任何一点处,由静止释放电子恰能从MNPQ区域左下角P点离开;

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题型:单项选择题

Valentine’s Day was the time my father chose to show his love for the special people in his life. Over the years I fondly thought (31) him as my "Valentine man".

My first recollection of the magic he could bring to Valentine’s Day came when I was six. That morning at the breakfast table I found a card and a gift-wrapped package at my chair. The card was (32) "Love, Dad" and the gift was a ring with a small piece of red glass to represent my birthstone, a ruby.There is (33) difference between red glass and rubies to a child of six, and I remember wearing that ring with pride that all the cards in the world (34) not surpass.

As I grew older, the gifts gave (35) to heart-shaped boxes filled with my favorite chocolate and always included a (36) card signed "Love,Dad". In those years my thank-you became more of a perfunctory response. The cards seemed less (37) , and I took for granted that the Valentine would always be there. I had (38) my hopes and dreams in receiving cards and gifts from "significant others" and "Love, Dad" just didn’t seem quite enough.His final card remains on my desk today. It’s a (39) of how special fathers ean be and how important it has been to me over the years to know that I had a father who continued a tradition of love with simple acts of understanding and an ability to express happiness over the people in his life.Those things never (40) , nor does the memory of a man who never tried being my Valentine.

32()。

A.r.ead

B. written

C. shown

D. signed

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