驴小弟变石头测试题及答案
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驴小弟变石头(英文版)
田红
资源113
Sylvester Duncan lived with his mother and father at Acorn Road in Oatsdale. One of his hobbies was collecting pebbles of unusual shape and color.
On a rainy Saturday during vacation he found a quite extraordinary one. It was flaming red, shiny, and perfectly round, like a marble. The rain felt cold on his back. "I wish it would stop raining,“ he said.
To his great surprise the rain stopped. and the sun was shining as if rain had never existed。
He guessed that the magic must be in the remarkable-looking red pebble.
驴小弟变石头(英文版)
田红
资源113
Sylvester Duncan lived with his mother and father at Acorn Road in Oatsdale. One of his hobbies was collecting pebbles of unusual shape and color.
On a rainy Saturday during vacation he found a quite extraordinary one. It was flaming red, shiny, and perfectly round, like a marble. The rain felt cold on his back. "I wish it would stop raining,“ he said.
To his great surprise the rain stopped. and the sun was shining as if rain had never existed。
He guessed that the magic must be in the remarkable-looking red pebble.
复变函数测试题及答案
复变函数测验题
第一章 复数与复变函数
一、
选择题
1.当z?1?i1007550时,z?z?z的值等于( ) 1?i(A)i (B)?i (C)1 (D)?1 2.设复数z满足arc(z?2)??3,arc(z?2)?5?,那么z?( ) 6(A)?1?3i (B)?3.复数z?tan??i(3?i (C)?1331?i (D)??i 2222?????)的三角表示式是( ) 2?[cos(??)?isin(??)] (B)sec?[cos((A)sec22??3?3???)?isin(??)] 22?[cos((C)?sec3?3?????)?isin(??)](D)?sec?[cos(??)?isin(??)] 2222224.若z为非零复数,则z?z与2zz的关系是( )
2222(A)z?z?2zz (B)z?z?2zz
22(C)z?z?2zz (D)不能比较大小
5.设x,y为实数,z1?x?11?yi,z2?x?11?yi且有z1?z2?12,则动点(x,y)的轨迹是( )
(A)圆 (B)椭圆 (C)双曲线 (D)抛物线
复变函数测试题及答案
复变函数测验题
第一章 复数与复变函数
一、
选择题
1.当z?1?i1007550时,z?z?z的值等于( ) 1?i(A)i (B)?i (C)1 (D)?1 2.设复数z满足arc(z?2)??3,arc(z?2)?5?,那么z?( ) 6(A)?1?3i (B)?3.复数z?tan??i(3?i (C)?1331?i (D)??i 2222?????)的三角表示式是( ) 2?[cos(??)?isin(??)] (B)sec?[cos((A)sec22??3?3???)?isin(??)] 22?[cos((C)?sec3?3?????)?isin(??)](D)?sec?[cos(??)?isin(??)] 2222224.若z为非零复数,则z?z与2zz的关系是( )
2222(A)z?z?2zz (B)z?z?2zz
22(C)z?z?2zz (D)不能比较大小
5.设x,y为实数,z1?x?11?yi,z2?x?11?yi且有z1?z2?12,则动点(x,y)的轨迹是( )
(A)圆 (B)椭圆 (C)双曲线 (D)抛物线
实变函数测试题与答案
实变函数试题
一,填空题
??1. 设An??,2?,
?n?1n?1,2?,
An????????????????. 则limn??2. ?a,b?????,???,因为存在两个集合之间的一一映射为
??????????
1??cos,x?0y??2x3. 设E是R中函数的图形上的点所组成的
??0,????????x?0??E????????????????????????E集合,则,????????????????????????. n4. 若集合E?R满足E??E, 则E为???????????????????????集.
5. 若??,??是直线上开集G的一个构成区间, 则??,??满足:
????????????????????????????????????????, ????????????????????????????????????????.
6. 设E使闭区间?a,b?中的全体无理数集, 则
mE?????????????????.
?7. 若mE??fn(x)?f(x)??0, 则说?fn(x)?在E上????????????????.
nn8. 设E?R, x0?R,若???????????????????????
实变函数测试题与答案
实变函数测试题
一,填空题
?1?A?1. 设n?,2?, n?1,2?,
?n?An????????????????. 则limn??2. ?a,b?????,???,因为存在两个集合之间的一一映射为??????????
?????????????????????????????????????????????.
1??cos,x?0y??2xE3. 设是R中函数的图形上的点所组成的
?0,????????x?0??集合,则E?????????????????????????,E????????????????????????.
n4. 若集合E?R满足E??E, 则E为???????????????????????集.
5. 若??,??是直线上开集G的一个构成区间, 则??,??满足:
????????????????????????????????????????, ????????????????????????????????????????.
6. 设E使闭区间?a,b?中的全体无理数集, 则mE?????????????????.
f(x)?f(x)??0, 则说?fn(x)?在E上???????????????? 7.
实变函数测试题-参考答案
实变函数测试题1
本试题参考答案由08统计班15号 李维提供 有问题联系15173241399
1、设 A2n?1?(0,1/n),A2n?(0,n),n?0,1,2...,求出集列{An}的上限集和下限集合。 解:limAn??0,??;设x??0,??,则存在N,使x?N,因此n?N时,0?x?n,
n??即x?A2n,所以x属于下标比N大的一切偶指标集,从而x属于无限多An,得x?limAnn??又显然limAn??0,??,所以limAn??0,??。
n??n??n??limAn??;若有x?limAn,则存在A,使任意n?N,有x?An。因此若2n?1?N时,
n??x?A2n?1,即0?x?1.令n??得0?x?0,此不可能,所以limAn??。 nn??2、证明:f(x)为[a,b]上连续函数的充分必要条件是对任意实数c,集E?xf(x)?c和
??E1??xf(x)?c?都是闭集。
证明:必要性:若f(x)是?a,b?上连续函数,由第二章习题8可知E1和E是闭集。 充分性:若E1和E都是闭集。若有x0??a,b?,f(x)在x0点不连续。则存在
?0?0,xn?x0,f?xn??f?x0???0,或f?xn??f?x0???0,不妨
英语名词单数变复数测试题
初一英语名词单数变复数专项练习题
一: 名词单数变复数填空
1::orange text bed
computer .apple house plane tree lesson apple shirt month
2:piano photo radio zoo tomato .potato :3:class fox watch glass dress class .brush box bus :4:shelf knife wife life .leaf
英语名词单数变复数测试题
初一英语名词单数变复数专项练习题
一: 名词单数变复数填空
1::orange text bed
computer .apple house plane tree lesson apple shirt month
2:piano photo radio zoo tomato .potato :3:class fox watch glass dress class .brush box bus :4:shelf knife wife life .leaf
浮力测试题及答案
宜城市官庄中学 梅云波 1
第十章 浮力 测试题 姓名 分数
一.选择题(共66分)
1.质量相同的两个实心物体甲和乙,体积之比V甲:V乙=2:3,将它们轻轻放入水中,静止时
33
所受的浮力之比F甲:F乙=8:9,ρ水=1×10kg/m,下列说法正确的是( )
A.甲,乙两物体都漂浮在水面上 B.甲物体漂浮在水面上,乙物体浸没于水中 C.乙物体的密度ρ乙=0.75×10kg/m D.乙物体的密度ρ乙=0.85×10kg/m 2.如图所示,悉尼奥运会实现了火炬在水中传递,下列说法正确的是( ) A.火炬在水中受到的浮力一定大于重力
B.下潜的深度越大,火炬手受到水的压强越大 C.潜水服表面光滑是为了增大水的阻力 D.火炬手向前运动,脚蹼必须向前划水
3.一枚重量为G的鸡蛋悬浮在盐水中,如图所示.往盐水中继续均匀缓慢加盐,鸡蛋所受浮力F随时间t变化的图象可能是( )
3
3
3
3
A. B. C. D.
4.甲、乙两个自重不计的薄壁圆柱形容器,盛有两种不同的液体,将两个相同的小球分别放入液体中,小球静止时位置如图所示,此时液面相平.则( ) A.甲中液体密度比乙中液体密度小
B.小球在甲