2006年9月笔试试卷参考答案 一、选择题 (1)D)(2)A)(3)C)(4)B)(5)D)(6)C)(7)D)(8)B) (9)B)(10)A)(11)D)(12)A)(13)C)(14)B)(15)D)(16)D) (17)D)(18)B)(19)C)(20)A)(1)B)(22)C)(23)D)(24)C) (25)A)(26)C)(27)D)(28)B)(9)B)(30)A)(31)D)(32)B) (33)A)(34)B)(35)D)

一、判断题 1两共线矢量a与b的矢性积的模等于以与b为边所构成的 平行四边形的面积() 2两矢量a与b共线的充要条件是axb=0() 3矢量a{X1,F,Z}与b{X2,H2,Z2}相互垂直的充要条件是 x1X2+YY2+2122=0() 4两矢量a与b相互垂直的充要条件是a·b=0() 5矢性积是反交换的,即a×b=-(b×a)()

Conjugated unsaturated systems have a p orbital on a carbon adjacent to a double bond The p orbital can come from another double or triple bond The p orbital may be the empty p orbital of a carbocation or a p orbital with a single electron in it (a radical)

1.证明a(t)是常向量的充要条件是a(t)=0 2.证明()x()()x()+i()x 4.设向量函数a(t)满足a(t)a'=0,a(t)xa=0,证明a()是常向量。 5.证明F(t)=(2t-1,t2-2,-t2+4t)为共面向量函数

Recently I wrote about 10 qualities of a good employee, which prompted quite a few people to ask about the attributes of a good manager. There isn’t a magic formula for good management, of course, but if you’re a manager, perhaps these tips will help you be more effective. 1. Choose a field thoughtfully. Make it one you enjoy. It’s hard to be

Problem Set 4 Solutions Due: Monday, February 28 at 9 PM Problem 1. Prove all of the following statements except for the two that are false; for those, provide counterexamples. Assumen 1. When proving each statement, you may assume all its predecessors (a)a =(mod n) Solution. Every number divides zero, so n (a-a), which means a a (mod n). (b)a≡b(modn) impliesa(modn)

一、选择题 (1)C)(2)A)(3)C)(4)D)(5)C(6)D)(7)A)(8)A) (9)B)(10)B)(11)C)(12)D)(13)C)(14)C)(15)C)(16)B) (17)A)(18)B)(19)B)(20)D)(1)B)(22)B)(23)A)(24)D) (25)C)(26)B)(27)B)(28)C)(29)D)(30)B)(31)A)(32)C) (33)B)(34)C)(35)A)

1线性空间的定义 设V是一个非空集合,R为实数域如果对于任 意两个元素a,B∈V,总有唯一的一个元素∈V与 之对应称为a与的和记作y=a+又对于任 数∈R与任一元素a∈V,总有唯一的一个元素 δ∈V与之对应称为与a的积,记作δ=λa;并且这 两种运算满足以下八条运算规律(设a,,y∈V;