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2.6.1分块矩阵的乘法,准对角阵的乘积和秩 1、矩阵的分块和分块矩阵的乘法 设A是属于K上的m×n矩阵,B是K上n×k矩阵,将A的行分割r段,每段分别包含m,m2,,m,个行,又将A的列分割为s段,每段包含nn2,n个列。于是A可用
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You work for an airline you have just received a letter from a customer who says that she had a terrible flight, that her bags did not arrive until two days later, and that one of her bags was broken. Write a letter apologizing and ask for further information so that you can arrange
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Letter Writing Practice 2 Test Yourself You office needs to rent a video camera for one month. You need a small machine that produces a professional quality image. Write to Photofinish Ltd and ask them if they rent machines like that and the price. Write a full business letter. (invent any details you need)
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Lecture 10 General Introduction of Argumentative Essay Objectives To learn how a composition is different from a paragraph To learn how to write a composition generally Writing instructions The purpose of argumentation is to convince. Argumentative essays should have a debatable point, sufficient evidence, and good and clear logic
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外研版(三起)(2012)小学英语五年级下册Module 2 Unit 2 Mr Li was a teacher.Module 2 Unit 2 Mr Li was a teacher.课件(5)
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Content 1. summary of last article 2. exchange writing activity 3. a brief introduction of types of essays 4. Writing Is a process 5. writing is a social act 6.Task: write a story about yourself to your classmates
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1.经纬仪测量水平角时,正倒镜瞄准同一方向所读的水平方向值理论上应相差() A180°B0°C90°D270° 2.1:5000地形图的比例尺精度是() A5 m B0. mm C5 cm D 50 cm 3.以下不属于基本测量工作范畴的一项是() A高差测量B距离测量C导线测量D角度测量 、一、单项选择题 4.已知某直线的坐标方位角为220°,则其象限角为() 在下列每小题的日 A220° B40° C南西50° D南西40° 案,并将其字母标号填
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1设E是直线上的一有界集,mE>0,则对任意小 于mE的正数,恒有子集E1,使m*E1=c 证明:由于E有界,故不妨令EC[a,b 令f(x)=m*(en[a,x),则f(a)0,f(b)=m*E 下证f(x)在[a,b]上连续
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一、单项选择题(10×1=10) 1、经济法律关系的内容是() A、享有经济权利和承担经济义务的当事人 、、、、 B、主体权利和义务所指向的对象 C、主体享有的经济权利和承担的经济义务 D、经济法律事实 2、刑事制裁的方式是( ) A、拘留B、罚金C、返还原物D、支付违约金 3、股票上市要求公司股本总额不得少于人民币()万元 A、1000B、3000C、5000D、6000 4、在中外合资经营企业注册资本中,外国合营者的出资比例一般不低于() A、10%B、25%C、35%D、49%
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1. Listening Comprehension(每题1分,共20分) 1.c2.c3.b4.b5.c6.c7.b8.b9.c10.b11.12.a13.a14.a15.b16.d 17.d18.b19.d20.B
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